After President Trump announced that the U.S. will pull out of the Paris Climate Accord, three men decided that they could not sit idly by.

British climate scientist Daniel Price teamed with New Zealander Adrien Taylor and American Jeff Willis to begin a project in protest. They called the effort Trump Forest.

It’s a campaign to plant ten-billion trees around the world. Price says that’s about how many it will take to offset the increased carbon pollution expected if the U.S. repeals the Clean Power Plan, a policy that helps reduce carbon pollution.

Price: “We’d have to cover the approximate area of the U.S. state of Kentucky in trees to offset these additional emissions.”

To contribute, people can plant trees locally and send a receipt as proof. Or monetary donations can be made to support mangrove reforestation in Madagascar.

More than a million trees have been pledged since the campaign started last year. There’s still a long way to go, but Price is hopeful that, in five to ten years, the group will reach the ten-billion tree goal.

And he says, in the process, the initiative does more than offset carbon pollution. It’s also …

Price: “… a way for people to raise their voices against climate ignorance in whatever forms.”

Reporting credit: Mark Knapp/ChavoBart Digital Media.