[Restorer]

There is a definite contradiction in this article.

They do not define "pollution." Naturally released chemicals do not logically fall under such a heading.

[endthematrix]

Re: Naturally released chemicals

Explain your point. I'm having trouble understanding.

[jrushing]

Although scientists knew that trees contribute substantial amounts of VOCs to the atmosphere, the rate of increase in recent decades was previously unrecognized.

"It's just one of those biological correlations," said Purves. "What you want is a fast-growing tree that doesn't produce a lot of VOCs, but that doesn't seem to exist."