Environmental geeks plant trees

The principle of www.tree-nation.com is very simple: a free social community where every 10 people signing in, a tree is planted in Nigeria.
The excuse is fighting climate change. But the REAL motivation is to plant 8 million trees, drawing a giant heart shaped park. Seriously, can it get more geek than that?
Actually yes, it could be a Pac Man shape ;P
No seriously, folx, sign in!