"Planting trees has plenty of benefits, but this popular carbon-removal method alone can’t possibly counteract the planet-warming emissions caused by the world’s largest fossil-fuel companies. To do that, trees would have to cover the entire land mass of North and Central America, according to a study out Thursday.

Many respected climate scientists and institutions say removing carbon emissions — not just reducing them — is essential to tackling climate change. And trees remove carbon simply by “breathing.” But crunching the numbers, researchers found that the trees’ collective ability to remove carbon through photosynthesis can’t stand up to the potential emissions from the fossil fuel reserves of the 200 largest oil, gas and coal fuel companies — there’s not enough available land on Earth to feasibly accomplish that.

And even if there were, if those 200 companies had to pay for planting all those trees, it would cost $10.8 trillion, more than their entire combined market valuation of $7.01 trillion. The researchers also determined that the companies would be in the red if they were responsible for the social costs of the carbon in their reserves, which scientists compute around $185 per metric ton of carbon dioxide."

Melina Walling reports for the Associated Press June 19, 2025. [2]