Why do you suspect that? I am not really even active on this website, I decided to jump in on this topic because it is a matter of what I do and study everyday.... well far sider, are you a geologist? even a naturalist? Sorta insulting that people will discredit my job because I have comments about the Earth and a mountain to post.
I'm just a chemical engineer, but even I know you can't make a legitimate comparison between Venus and Earth, just because both planets have CO2 in their atmospheres.
And yes it is likely that there are more trees now than when the pilgrims landed. The indians did not have ways to control the massive forest fires and grass fires that frequently used to burn across the plains. And they also didn't have Arbor Day as far as we know. Stick around FR awhile and maybe you will learn a few things.