I read somewhere that trees help seed clouds, thus causing rain (or maybe just moisture in the air? I forget), though it seems like it's also a vicious cycle -

I read somewhere that trees help seed clouds, thus causing rain (or maybe just moisture in the air? I forget), though it seems like it's also a vicious cycle - the areas not in drought continue to not be in drought, whereas areas that are lose trees that could've seeded clouds, and thus rain. That said, I agree with the points made in the article. "Trees are good" is a pretty uncontroversial stance. Should be, anyway. I do wonder, if the biophilia thing is real, and it seems reasonable that it is - are some trees better at creating this effect than others, even if the same size? If so, does it vary by region, cultural/ethnic background, etc., and what do those trees that are unusually biophilia-inducing have in common? I have no idea what the answers to those questions are, and there's a lot of speculation before you need to ask it, but it seems like some university or government or something should be researching those questions right now, what with all the plans to make cities greener.