Imagine a city where the air is so clean you can breathe deeply and feel it fill your lungs with freshness. A city where trees grow happily, rivers reflect the sun, and the sky is always blue, without gray clouds of smoke. In this place, there are no noisy engines or streets filled with honking horns. Here, people get around on magical bicycles, speedy scooters, wind-powered trains, and buses that run on sunlight.

But this city wasn't always like this. There was a time when smoke covered the avenues and children couldn't play outdoors without feeling tired. Everything changed when its inhabitants decided they wanted a better world. Then, they began to discover new and surprising ways to get around without polluting. They learned that the energy of the sun, wind, and water could do incredible things and that nature held many secrets waiting to be discovered.

Here, you'll learn wonderful stories, full of adventures and characters that will make you fall in love with this car-free place. You'll ride the wind train, see a bus that sparkles in the sunlight, discover shoes that light the way, and streets where trees have taken center stage. And best of all, you'll learn how you can help make the real world a little more like this fantastical city.

Because the future is in your hands. Because every choice we make changes the world. And because caring for the planet can be the most exciting adventure of all.