FILE - In this Dec. 4, 2018 file photo, people walk in Tree Library park in Milan, Italy. The city has ambitious plans to plant 3 million new trees by 2030_ a move that experts say could offer relief to the city's muggy and sometimes tropical weather. A study released on Thursday, July 4, 2019 says that the most effective way to fight global warming is to plant lots of trees - a trillion of them, maybe more. (AP Photo/Luca Bruno)

Best way to fight climate change? Plant a trillion trees

July 04, 2019 - 2:01 pm

WASHINGTON (AP) — A study says the best way to fight global warming is to plant a trillion trees — maybe more.

Swiss scientists calculate that there's enough space to plant trees to cover 3.5 million square miles. That's roughly the size of the United States

The study says those new trees could suck up about as much carbon pollution as humans have spewed in the past 25 years.

Study author Thomas Crowther says this is the cheapest and best climate change solution. But trees are no substitute for cutting emission from burning oil, gas and coal.

The study is in Thursday's journal Science.

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