If you could have one superpower, what would it be?

We were asked that question recently by some high school students in Kentucky.

They also asked us about our favorite breakfast cereal (Bill: Cocoa Puffs; Melinda: Wheat Chex); what animal we would want to be (Bill: a bonobo; Melinda: a white leopard); and if we know how to dance the Whip and Nae Nae (one of us does—but we’re not telling which one).They also asked us about our favorite breakfast cereal (Bill: Cocoa Puffs; Melinda: Wheat Chex); what animal we would want to be (Bill: a bonobo; Melinda: a white leopard); and if we know how to dance the Whip and Nae Nae (one of us does).

The superpower question was our favorite.

To fly. To be invisible. To travel through time. All good options.

Trying to keep up with our foundation work and our three children’s schedules, we gave responses that will be immediately familiar to other parents.

“More time!”

“More energy!”

When we sat down to write this year’s letter, those answers stuck with us. Sure, everyone wants more time and energy. But they mean one thing in rich countries and something else entirely when looked at through the eyes of the world’s poorest families.

Poverty is not just about a lack of money. It’s about the absence of the resources the poor need to realize their potential. Two critical ones are time and energy.

More than one billion people today live without access to energy. No electricity to light and heat their homes, power hospitals and factories, and improve their lives in thousands of ways.

Likewise, a lack of time creates obstacles too. It’s not simply the feeling of not having enough hours in the day. It’s the crippling effect of having to perform the backbreaking work that needs to get done when there’s no electricity.

We are dedicating this year’s letter to talking about the opportunities we see to overcome these often overlooked challenges. We’re writing to high school students because you’re the ones who will ultimately be solving these problems. (Our interests in time and energy are separate from our foundation’s work on health and poverty. But it’s all related. Solving these problems will make it easier to save lives and make the world a more equitable place.)

More time. More energy. As superpowers go, they may not be as exciting as Superman’s ability to defy gravity. But if the world can put more of both into the hands of the poorest, we believe it will allow millions of dreams to take flight.

More Energy

Bill: At some point today, you’ll probably do one or all of these things: Flip a switch for light. Take fresh food from a refrigerator. Turn a dial to make your home warmer or cooler. Press a button on your laptop to go online.

You probably won’t think twice about any of these actions, but you will actually be doing something extraordinary. You will be using a superpower—your access to energy.

Does that sound ridiculous?

Just imagine, for a minute, life without energy.

You don’t have a way to run a laptop, mobile phone, TV, or video games. You don’t have lights, heat, air conditioning, or even the Internet to read this letter.

About 1.3 billion people—18 percent of the world’s population—don’t need to imagine. That’s what life is like for them every day.

You can see this fact for yourself in this photograph of Africa at night taken from space.

Africa has made extraordinary progress in recent decades. It is one of the fastest-growing regions of the world with modern cities, hundreds of millions of mobile phone users, growing Internet access, and a vibrant middle class.

But as you can see from the areas without lights, that prosperity has not reached everyone. In fact, of the nearly one billion people in sub-Saharan Africa, 7 out of every 10 of them live in the dark, without electricity. The majority of them live in rural areas. You would see the same problem in Asia. In India alone, more than 300 million people don’t have electricity.

If you could zoom into one of those dark areas in that photograph, you might see a scene like this one. This is a student doing her homework by candlelight.

A young girl studies by candlelight in Tanzania, 2015

I’m always a little stunned when I see photographs like this. It’s been well over a century since Thomas Edison demonstrated how an incandescent light bulb could turn night into day. (I’m lucky enough to own one of his sketches of how he planned to improve his light bulb. It’s dated 1885.) And yet, there are parts of the world where people are still waiting to enjoy the benefits of his invention.

If I could have just one wish to help the poorest people, it would be to find a cheap, clean source of energy to power our world.

You might be wondering, “Aren’t people just trying to stay healthy and find enough to eat? Isn’t that important too?” Yes, of course it is, and our foundation is working hard to help them. But energy makes all those things easier. It means you can run hospitals, light up schools, and use tractors to grow more food.

Think about the history classes you’re taking. If I had to sum up history in one sentence it would be: “Life gets better—not for everyone all the time, but for most people most of the time.” And the reason is energy. For thousands of years, people burned wood for fuel. Their lives were, by and large, short and hard. But when we started using coal in the 1800s, life started getting better a lot faster. Pretty soon we had lights, refrigerators, skyscrapers, elevators, air conditioning, cars, planes, and all the other things that make up modern life, from lifesaving medicines and moon landings to fertilizer and Matt Damon movies. (The Martian was my favorite movie last year.)

Without access to energy, the poor are stuck in the dark, denied all of these benefits and opportunities that come with power.

So if we really want to help the world’s poorest families, we need to find a way to get them cheap, clean energy. Cheap because everyone must be able to afford it. Clean because it must not emit any carbon dioxide—which is driving climate change.

I’m sure you have read about climate change and maybe—hopefully!—studied it in school. You might be worried about how it will affect you. The truth is, the people who will be hit the hardest are the world’s poorest. Millions of the poorest families work as farmers. Changes in weather often mean that their crops won’t grow because of too little rain or too much rain. That sinks them deeper into poverty. That’s particularly unfair because they’re the least responsible for emitting CO_2, which is causing the problem in the first place.I’m sure you have read about climate change and maybe studied it in school. You might be worried about how it will affect you. The truth is, the people who will be hit the hardest are the world’s poorest. Millions of the poorest families work as farmers. Changes in weather often mean that their crops won’t grow because of too little rain or too much rain. That sinks them deeper into poverty. That’s particularly unfair because they’re the least responsible for emitting CO_2, which is causing the problem in the first place.

Scientists say that to avoid these dramatic long-term changes to the climate, the world must cut greenhouse gas emissions by up to 80 percent by 2050, and eliminate them entirely by the end of the century.

A farmer’s dried-up cropland, Assam, India 2014

A farmer’s dried-up cropland, Assam, India 2014

When I first heard this I was surprised. Can’t we just aim to cut carbon emissions in half? I asked many scientists. But they all agreed that wouldn’t be enough. The problem is that CO₂ lingers in the atmosphere for decades. Even if we halted carbon emissions tomorrow, the temperature would still rise because of the carbon that’s already been released. No, we need to get all the way down to zero.

That’s a huge challenge. In 2015, the world emitted 36 billion tons of carbon dioxide to produce energy. This is a mind-boggling number. (It’s worth remembering, because it will come in handy. For example, someone may tell you they know how to remove 100 million tons of carbon per year. That sounds like a lot, but if you do the math—100 million divided by 36 billion—you’ll see that they’re talking about 0.3 percent of the problem. Every reduction in emissions helps, but we still have to work on the other 99.7 percent.)

How can we ever reduce a number like 36 billion tons to zero?

Whenever I’m confronted with a big problem I turn to my favorite subject: math. It’s one subject that always came naturally to me, even in middle school when my grades weren’t that great. Math cuts out the noise and helps me distill a problem down to its basic elements.

Climate change is an issue that has plenty of noise surrounding it. There are those who deny it is a problem at all. Others exaggerate the immediate risks.

What I needed was an equation that would help me understand how we might get our CO₂ down to zero.

Here’s what I came up with:

That might look complicated. It’s not.

On the right side you have the total amount of carbon dioxide (CO₂) we put in the atmosphere. This is what we need to get to zero. It’s based on the four factors on the left side of the equation: the world’s population (P) multiplied by the services (S) used by each person; the energy (E) needed to provide each of those services; and finally, the carbon dioxide (C) produced by that energy.

As you learned in math class, any number multiplied by zero will equal zero. So if we want to get to zero CO₂, then we need to get at least one of the four factors on the left to zero.

Let’s go through them, one by one, and see what we get.

The world’s population (P) is currently 7 billion and expected to increase to 9 billion by 2050. No chance it’ll be zero. (If it is, we won’t have climate change, but something else bad must have happened!) The world’s population (P) is currently 7 billion and expected to increase to 9 billion by 2050. No chance it’ll be zero.

Next, services. This is everything: food, clothing, heat, houses, cars, TV, toothbrushes, Elmo dolls, Taylor Swift albums, etc. This is the number that I was saying earlier needs to go up in poor countries, so people can have lights, refrigerators, and so on. So (S) can’t be zero, either.

Let’s take a look at (E). That’s the energy needed per service. There’s some good news here. Fuel-efficient cars, LED light bulbs, and other inventions are making it possible to use energy more efficiently.

Many people, and you may be one of them, are also changing their lifestyles to conserve energy. They’re biking and carpooling to save gas, turning down the heat a couple degrees, adding insulation to their homes. All of these efforts help cut down on energy use.

Unfortunately, they don’t get us to zero. In fact, most scientists agree that by 2050 we’ll be using 50 percent more energy than we do today.

So none of the first three—population, services, and energy—are getting close to zero. That leaves the final factor (C), the amount of carbon emitted per each unit of energy.

The majority of the world’s energy, other than hydro and nuclear, is produced by fossil fuels like coal that emit an overwhelming amount of CO₂. But there’s some good news here, too. New green technologies are allowing the world to produce more carbon-free energy from solar and wind power. Maybe you live near a wind farm or have seen solar panels near your school.

It’s great that these are getting cheaper and more people are using them. We should use more of them where it makes sense, like in places where it’s especially sunny or windy. And by installing special new power lines we could make even more use of solar and wind power.

But to stop climate change and make energy affordable for everyone, we’re also going to need some new inventions.

Why? Solar and wind power are reliable energy sources so long as the sun is shining and the wind is blowing. But people still need dependable energy on cloudy days, at nighttime, and when the air is still. That means power companies often back up these renewable sources with fossil fuels like coal or natural gas, which emit greenhouse gases.

It would help, of course, if we had a great system for storing solar and wind power. But right now, the best storage option is rechargeable batteries, and they are expensive. Lithium-ion batteries like the one inside your laptop are still the gold standard. If you wanted to use one to store enough electricity to run everything in your house for a week, you would need a huge battery—and it would triple your electric bill.

So we need more powerful, more economical solutions.

In short, we need an energy miracle.

When I say “miracle,” I don’t mean something that’s impossible. I’ve seen miracles happen before. The personal computer. The Internet. The polio vaccine. None of them happened by chance. They are the result of research and development and the human capacity to innovate.

In this case, however, time is not on our side. Every day we are releasing more and more CO₂ into our atmosphere and making our climate change problem even worse. We need a massive amount of research into thousands of new ideas—even ones that might sound a little crazy—if we want to get to zero emissions by the end of this century.

New ways to make solar and wind power available to everyone around the clock could be one solution. Some of the crazier inventions I’m excited about are a possible way to use solar energy to produce fuel, much like plants use sunlight to make food for themselves, and batteries the size of swimming pools with huge storage capacity.

Many of these ideas won’t work, but that’s okay. Each dead end will teach us something useful and keep us moving forward. As Thomas Edison famously said, “I have not failed 10,000 times. I’ve successfully found 10,000 ways that will not work.”

But to find thousands of ways that won’t work, you first need to try thousands of different ideas. That’s not happening nearly enough.

Governments have a big role to play in sparking new advances, as they have for other scientific research. U.S. government funding was behind breakthrough cancer treatments and the moon landing. If you’re reading this online, you have the government to thank for that too. Research paid for by the U.S. government helped create the Internet.

But energy research and the transition to new energy sources takes a long time. It took four decades for oil to go from 5 percent of the world’s energy supply to 25 percent. Today, renewable energy sources like wind and solar account for less than 5 percent of the world’s energy.

So we need to get started now. I recently helped launch an effort by more than two dozen private citizens that will complement government research being done by several countries. It’s all aimed at delivering energy miracles.

You may be wondering what you can do to help.

First, it’s important for everyone to get educated about this energy challenge. Many young people are already actively involved in climate and energy issues and I’m sure they could use more help. Your generation is one of the most globally minded in history, adept at looking at our world’s problems beyond national borders. This will be a valuable asset as we work on global solutions in the decades ahead.

Second, if you’re someone with some crazy-sounding ideas to solve our energy challenge, the world needs you. Study extra hard in your math and sciences. You might just have the answer.

The challenge we face is big, perhaps bigger than many people imagine. But so is the opportunity. If the world can find a source of cheap, clean energy, it will do more than halt climate change. It will transform the lives of millions of the poorest families.

I'm so optimistic about the world’s ability to make a miracle happen that I’m willing to make a prediction. Within the next 15 years—and especially if young people get involved—I expect the world will discover a clean energy breakthrough that will save our planet and power our world.

I like to think about what an energy miracle like that would mean in a slum I once visited in Nigeria. It was home to tens of thousands of people but there was no electricity. As night fell, no lights flickered on. The only glow came from open fires lit in metal barrels, where people gathered for the evening. There was no other light for kids to study by, no easy way to run a business or power local clinics and hospitals. It was sad to think about all of the potential in this community that was going untapped.

A cheap, clean source of energy would change everything.

Imagine that.

More Time

Melinda: I’m sure you’ve seen images like this one. I think they’re hilarious. And they remind me of how much has changed since I was a girl in Dallas in the 1970s, back when we watched Wonder Woman instead of Supergirl.

My brothers and sister and I had a lot of friends whose mothers, as we used to say, stayed home instead of working (though now I know that staying home is working—and working very hard, even though you don’t get paid for it).

The moms in our neighborhood seemed to spend most of their time in the kitchen. I’m interested in design, so I know now that their kitchens were “triangle kitchens,” with the fridge, sink, and stove laid out to make whipping up an omelet as quick and easy as possible. Kitchen design was a fad throughout the 20th century. In one demonstration, a woman baked two identical strawberry shortcakes, one in a regular kitchen and the other in a new and improved version. The process required 281 footsteps the first time around but only 41 the second. The kitchen itself made cake-baking 85 percent more efficient!

What the triangle kitchen didn’t do was challenge the idea that women were supposed to spend most of their lives in the kitchen, retracing their steps in a seemingly endless triangle.

But this is 2016, not the 1970s or the 1950s. If you’re an American, three out of four moms at your school have a job. Your father probably does at least some cooking. There’s a 35 percent chance you live with one parent (which means he or she has to do all the paid work and all the unpaid work). Maybe you split your time between two houses and four parents, or maybe both your parents are moms (or dads). The world has changed a lot.

I know from listening to my kids and their friends—and from looking at polling data about how teenagers see the future—that most girls don’t think they will be stuck with the same rules that kept their grandmothers in the home. And most boys agree with them.

I’m sorry to say this, but if you think that, you’re wrong. Unless things change, girls today will spend hundreds of thousands more hours than boys doing unpaid work simply because society assumes it’s their responsibility.

Unpaid work is what it says it is: It’s work, not play, and you don’t get any money for doing it. But every society needs it to function. You can think of unpaid work as falling into three main categories: cooking, cleaning, and caring for children and the elderly. Who packs your lunch? Who fishes the sweaty socks out of your gym bag? Who hassles the nursing home to make sure your grandparents are getting what they need?

Now, this work has to be done by somebody. But it’s overwhelmingly women who are expected to do it, for free, whether they want to or not.

This holds true in every single country in the world. Globally, women spend an average of 4.5 hours a day on unpaid work. Men spend less than half that much time. But the fact is that the burden of unpaid work falls heaviest on women in poor countries, where the hours are longer and the gap between women and men is wider. In India, to take one example, women spend about 6 hours, and men spend less than 1 hour.

Most girls in poor countries don’t have a triangle kitchen. Instead, they move in long, straight lines, back and forth, because they have to walk miles to fetch water and chop wood. The geometry of their footsteps is different, but it’s still based on the assumption that keeping the household running is their responsibility. The massive number of hours these girls spend on these tasks distorts their entire lives. It’s almost impossible for those of us lucky enough to live in rich countries to understand how unpaid work dominates the lives of hundreds of millions of women and girls.

When I visited Tanzania a couple of years ago, I spent a few days with Anna and Sanare and their six kids. Anna’s day started at 5 a.m. with lighting a fire to cook breakfast. After we cleaned up, we fetched water. Once Anna’s bucket was full it weighed 40 pounds. (The average distance women walk to get clean water in rural Africa and Asia is two miles each way. Imagine doing that with almost half your body weight on your head!) When we got back to the house I was exhausted, even though I’d carried less than Anna. But we couldn’t rest, because it was time to build the fire again for lunch. After that we went into the forest to chop wood for the next day’s fires, being careful not to get stung by scorpions. Then we went for more water, then milked the goats, then dinner. We were up past 10 at night, washing dishes in the moonlight.

How many thousands of steps did I take that day? However many it was, Anna had to multiply that number by every day of her life.

Why am I counting the footsteps of women around the world, like a human Fitbit?

Because you are imagining your future right now, and I want your feet to lead you wherever you’re going to find the most meaning and satisfaction.

It's not just about fairness; assigning most unpaid work to women harms everyone: men, women, boys, and girls.

The reason? Economists call it opportunity cost: the other things women could be doing if they didn’t spend so much time on mundane tasks. What amazing goals would you accomplish with an extra hour every day? Or, in the case of girls in many poor countries, an extra five or more? There are lots of ways to answer this question, but it’s obvious that many women would spend more time doing paid work, starting businesses, or otherwise contributing to the economic well-being of societies around the world. The fact that they can’t holds their families and communities back.

Girls in poorer countries might say they’d use extra time to do their homework. Housework comes first, so girls often fall behind in school. Global statistics show that it’s increasingly girls, not boys, who don’t know how to read. Anna and Sanare’s daughter Grace was always the last person in the house still awake because she did her homework only after she finished her chores, around the time the rest of us went to sleep.Girls in poorer countries might say they’d use extra time to do their homework. Housework comes first, so girls often fall behind in school. Global statistics show that it’s increasingly girls, not boys, who don’t know how to read.

Mothers might say they’d go to the doctor. In poor countries, moms are usually responsible for their kids’ health. But breastfeeding and traveling to the clinic take time, and research shows that health care is one of the first tradeoffs women make when they're too busy.

Some women might simply read a book or take a walk or visit a friend, and I totally support that, too. Everybody’s better off when more of us are fulfilled in our daily lives.

I’m writing this because I'm optimistic. Though no country has gotten the balance perfect yet, many have narrowed the unpaid labor gap by several hours a day. America and Europe have come a long way. The Scandinavian countries have gone even further.

The world is making progress by doing three things economists call Recognize, Reduce, and Redistribute: Recognize that unpaid work is still work. Reduce the amount of time and energy it takes. And Redistribute it more evenly between women and men.

Let’s start with Reducing, because that’s the most straightforward. Rich countries have done a great job of Reducing the time it takes to do most household tasks. That’s what the triangle kitchen was all about. Americans don’t fetch water because faucets fetch it for us, instantly. We don’t spend all day on a load of laundry because the washing machine does it in a half-hour. Cooking goes much faster when you start with a gas stove instead of an ax and a tree.

In poorer countries, though, most women still haul water, clean clothes by hand, and cook over an open flame.

The solution is innovation, and you can help. Some of you will become engineers, entrepreneurs, scientists, and software developers. I invite you to take on the challenge of serving the poor with cheap, clean energy, better roads, and running water. Or maybe you can invent ingenious labor-saving technologies. Can you imagine a machine that washes clothes using no electricity and very little water? Perhaps you can improve on the mortar and pestle, the 40,000-year-old technology I see women using to grind grain into food every time I travel in sub-Saharan Africa or South Asia.

But Reducing by itself isn’t enough, because it’s not just that housework takes a long time; it’s also that every culture expects women to do it. If tasks start taking less time, societies can (and do) simply assign women more tasks to fill up the time they’re deemed to have available. No matter how efficient we make housework, we won’t actually free up women’s time until we Recognize that it’s just as valuable as men’s.

This isn’t a global plot by men to oppress women. It’s more subtle than that. The division of work depends on cultural norms, and we call them norms because they seem normal—so normal that many of us don’t notice the assumptions we’re making. But your generation can notice them—and keep pointing them out until the world pays attention.

Think about your household chores. If you’re an American girl, you probably do 2 hours of chores a week more than boys. If you’re a boy, you’re 15 percent more likely to be paid for doing your chores. And what percent of girls’ chores are inside, and what percent of boys’ are outside? Why is that?

In TV commercials you see, how often are men doing laundry, cooking, or running after kids? (The answer: 2 percent of the time.) How many of the women are advertising kitchen or cleaning products? (More than half.)

Once we see these norms, we can replace them with something better.

What do those better norms look like? How are you going to Redistribute the work it takes to live?

It’s not an easy question.

For example, nobody supports a 50/50 split of all types of work at all times. Part of belonging to a family is cooperating, and sometimes one person is going to change a few more diapers because another is focused on a different important task.

Furthermore, not all unpaid work is created equal. Folding laundry isn’t rewarding, unless you’re one of those obsessively neat people. (I’m not.) But caring for a child or a sick relative is deeply meaningful, and many people, Bill and me included, want to take time to concentrate on that part of life. Sharing the burdens of unpaid work also means sharing the joys.

In fact, studies show that when fathers are able to take time off from paid work when their children are born, they spend more time with their kids and doing other kinds of housework for years to come. As a result, they form a stronger bond with their partners and children. That’s one reason why I think access to paid family and medical leave is so important for families.

In the end, the goal is to change what we think of as normal—and not thinking it’s funny or weird when a man puts on an apron, picks up his kids from school, or leaves a cute note in his son’s lunchbox.

When it comes to Recognize, Reduce, and Redistribute, the story of Anna and Sanare, the couple I stayed with in Tanzania, is pretty inspiring. When they got married, Anna moved from a lush part of the country to live in Sanare’s drought-ridden area. She had a hard time adjusting to the extra work that meant. Finally, Sanare came home one day to see Anna sitting on the steps ready to leave, her bags packed and their first child, Robert, in her arms. Sanare, heartbroken, asked how he could persuade her to stay. “Fetch water,” she said, “so I can nurse our son.” And so, Recognizing the imbalance, he did. He started walking the miles to the well every day. At first the other village men made fun of him and even accused Anna of witchcraft. But when he said, “My son will be healthier because I’m doing this,” they started Redistributing the work with him. After a while, when they got sick of working so hard, they decided to build water tanks to collect rainwater near the village. Now that they’ve Reduced, no matter who goes to get water, Anna or Sanare, it’s a lot closer—and they both spend more time with Robert and their other kids.

The world can learn a lot from this couple.

I can’t wait to see where your steps will lead you. Not necessarily in triangles. Not in straight lines, unless that’s what you want. But in any direction you choose.

Get Involved

We started this year’s letter asking the question, if you could have one superpower, what would it be?

Dreaming about whether you would want to read minds, see through walls, or have superhuman strength may sound silly, but it actually gets to the heart of what really matters in your life.

Every day in our work at the foundation, we are inspired by the people we meet doing extraordinary things to improve the world.

They have all tapped into a different kind of superpower that all of us possess: the power to make a difference in the lives of others.

We’re not saying that everyone needs to dedicate their lives to the poor. Your lives are busy enough doing homework, playing sports, making friends, pursuing your dreams. But we do think that you can live a more powerful life when you dedicate some of your time and energy to something much larger than yourself. Find an issue you’re passionate about and learn more. Volunteer or, if you can, donate a little money to a cause. Whatever you do, don’t be a bystander. Get involved. You may have the opportunity to make your biggest impact when you’re older. But why not start now?

Our own experience working together on health, development, and energy the last two decades has been one of the most rewarding parts of our lives. It has transformed who we are and continues to fuel our optimism about how much the lives of the poorest people will improve in the years ahead.

We know it’s an experience that will change your life too. You’ll be like Clark Kent ducking away to change into his alter ego, emerging not with a pair of tights and a cape, but with superpowers you never knew you had.