Don’t have the actual letter to quote, but the main idea ensconced in said letter has burnt its way into my brain. So I paraphrase, and cannot attribute (comment section might be helpful)
“I appreciate the sense of companies trying to reduce CO2 emission, however planting trees is the wrong was around this. As global warming heats up the world, the chance of forest fires will increase, destroying all these trees.” (The writer then goes off on some half cocked idea about airlines sponsoring wind turbines as a way of solving the problem, presumably because they look a bit like propellers or something).
Nothing will increase global warming more of course than one huge global forest fire. So stop planting trees, you are destroying the Earth.