On Arbor Day (25 April) free porn site Pornhub launched it's aptly titled PR campaign,

Pornhub Gives America Wood
They promised to plant a tree for every 100 videos viewed in a nominated category (Big Dick, naturally)

12,000 trees have been planted as a result of the campaign. You have until May 2 to help make a difference.

ps, I learned about this campaign at Mashable, not Pornhub

pps, Would you gamble more if you knew every time you got Blackjack a tree would be planted somewhere, or maybe a needy family in Sudan received a goat?

I've never seen this type of charitable-cause-cross-promotion with casino gambling (maybe Paddy Power have done something?).

We gamblers must be a pretty self interested lot