[WalterBright]

> planting trees is not nearly enough to stop climate change

The solution will be a mix of approaches, none of them in isolation doing the whole job.

> For outdoor air pollution, planting trees can actually increase it

Only if by doing so you remove vegetation to plant them.

[smt88]

> Only if by doing so you remove vegetation to plant them.

That is not correct. Read the article I linked that explains it. Biology isn't as simple as "CO2 => biomass".

[msandford]

I read the whole article and I can't find the part that backs up your statement. Not saying it might not be there, but telling people to figure it out on their own isn't super helpful.

In fact most of the article seems to agree that planting trees is a net good for removing CO2 and that the biggest problem is finding enough room to plant all the trees that are needed.