I don't know why, it's the same reason why you like some music and you don't like others. There's something about it that you like. Ultimately I don't find it's in my best interests to try and analyze it, since it's fundamentally emotional.
I always work from an outline, so I know all the of the broad events and some of the finer details before I begin writing the book.
On the environmental front there's concern about global warming and high levels of carbon dioxide, and trees take in CO2 and store carbon.

