The thing is, "increasing leaf area" is actually not the aim here. I'm from India and while the deforestation situation is not as bad as (say Brazil for Amazon Rain forest), it is still present in almost every country in the World. Agriculture does NOT mean "restoration". On top of that we should try to increase the restoration of native species of each country or every part of the world and not push non-native species just because they grow fast or take less attention while growing them. That destroys the ecosystem of that area because of something called as Invading Species. I'm not saying that every action taken is wrong or anything, but in this case deforestation outweighs reforestation by a huge margin.