The fires have cost the planet millions of trees, one of the Earth's best defenses against climate change. Now a movement around the globe is trying to replace trees lost to fire and deforestation for agriculture or grazing.
In Ethiopia, the prime minister announced a new #GreenLegacy initiative that planted more than 353 million trees in 12 hours. Even YouTube stars are getting in on the act: More than 600 social media personalities recently raised over $16 million to plant trees worldwide. The effort was led by Jimmy Donaldson, a YouTube star who's also known as MrBeast.
Reforestation is also a big part of the Paris climate agreement, which the U.S. recently abandoned at the behest of President Donald Trump.
But can planting billions and billions of trees really mitigate climate change? For that matter, is it even feasible?
Watch the video above to learn about current efforts to reforest the planet, the potential cost of inaction and the economics of planting billions of trees.