"The environment" is a hugely wide topic - outside of global warming t here are issues like refuse disposal, exhaustion of fossil fuels, nuclear waste disposal, biodiversity decline, GM crops the list is almost endless.
Consequently there's no such thing as "Both" viewpoints. Even the most radical oil man won't tell you that oil will last forever. In global warming some (admittedly not many now) will tell you the whole thing is a myth whilst others will tell you that it's real but not man made.
I guess this is probably why it's baffling.
Have you tried the BBC's site? here:
http://news.bbc.co.uk/1/hi/in_depth/sci_tech/2 004/planet/default.stm