Trees, like all plants, help fight climate change by absorbing carbon dioxide (CO2) and converting it into oxygen. But for thousands of years, humans have cut down forests to build cities, homes, and farms. We’ve also been burning fossil fuels, which produces CO2, and Earth’s trees can’t keep up.
The good news is that we might be able to reverse the damage. Scientists found that increasing the number of trees worldwide can help offset the CO2 pollution problem. That’s why cities like London, New York City, and Shanghai have pledged to plant more than a million trees—each!