World leaders from more than 190 countries have convened in Paris during the first two weeks of December for the long-awaited United Nations Climate Change Conference. Will the governments of the world finally pass a binding global treaty aimed at reducing the most dangerous impacts of global warming… or will they fail in this task?

Letters to the Future, a national project involving more than 40 alternative weeklies across the United States, set out to find activists, authors, artists, scientists and others willing to get creative and draft letters to future generations predicting the success or failure of the Paris talks—and what came after. Some participants were optimistic about what is to come; some not so much. We hereby present some of their visions of the future.

It’s hard to imagine writing to the granddaughter of my own daughter, but if you’re anything like her—strong, smart, occasionally a little stubborn—then I have no doubt the world is in good hands.

By now, your school should have taught you about climate change and how humans helped to bring it about with our big cars, big homes, big appetites and an endless desire for more stuff. But what the teachers and textbooks may not have passed on are the stories of incredible people who helped make sure the planet remained beautiful and livable for you.

These are stories of everyday people doing courageous things because they couldn’t stand by and watch communities poisoned by pollution, the Arctic melt or California die of fire and drought. They couldn’t bear to think of New Orleans under water again, or New York lost to a superstorm. Right now, as politicians weigh up options and opinion polls, people are organizing an uprising. It’s amazing to see and be a part of.

In the year that led up to the 2015 meeting of global leaders on climate change in Paris, kayakers took to the water to stop oil rigs. Nurses, musicians, grannies, preachers and even beekeepers took to the streets. The message was loud and clear: “We want clean, safe, renewable energy now!”

Were it not for this glorious rainbow of people power, I don’t know whether President Obama would have stepped up and canceled oil drilling in the Alaskan Arctic or the sale of 10 billion tons of American coal that were set to tip the planet towards climate chaos. But he did. This paved the way for an era of unprecedented innovation, as entrepreneurs and academics fine-tuned the best ways to harness the unlimited power of our wind, waves and sun, and make it available to everyone. We’ve just seen the first ever oceanic crossing by a solar plane, and I can only imagine what incredible inventions have grown in your time from the seeds planted in this energy revolution we’re experiencing right now.

I want to tell you about this because there was a time we didn’t think any of it was possible. And there may be times when you face similar challenges. Generations before you have taken acts of great courage to make sure you too have all the joys and gifts of the natural world—hiking in forests, swimming in clean water, breathing fresh air. If you need to be a little stubborn to make sure things stay that way, so be it. Onwards!

Currently the executive director of Greenpeace USA, Leonard made the 2007 film and 2010 bestselling book The Story of Stuff, which chronicles the life of material goods. Read more letters to the future here.