Trees are absolutely nothing compared to the algae in the oceans. Secondly, the small plants are just as important as trees. http://www.ecology.com/2011/09/12/important-organism/ Also, there isn't much that chopping down forests does in terms of global warming. We wouldn't have an issue if it weren't for the whole burning oil thing.
I really liked that article thanks for that. The problem with oil burning is what can take it's place? I really like the idea of electric cars, but their range is low and the charging stations take longer than a lot of people like, not to mention they are few and far between, then you have their pricing and people's minds about cost. Also, In terms of energy people are hesitant to support nuclear and I've heard that turbines and solar panels aren't all they're cracked up to be but have no evidence to that.
Gas cars have existed for ages. Electric cars, as a viable means of transport, are just now becoming viable. Give it a while and we will be done with gas. First we need green power, then we will worry about finding electric cars and/or the tech will exist by that point. Solar and turbines also really need storage to work well. People will stop being scared of nuke power if there is constant presence of true information.