I read a book by Brian Mclaren at Christmas. He said that because many Christians believe in the rapture, they feel no ownership and responsibility to the care of the earth. Because we are leaving (and soon) we think that enviromentalisim is a distraction to getting on with the job with soul winning. I quote from him below

To believe in God is to believe in the salvation of the world. The paradox of our time is that those who believe in God do not believe in the salvation of the world, and those who believe in the future of the world do not believe in God. Christians believe in the end of the world, they expect the final catastrophe the punishment of others.
On the radio news earlier this year, it said that one of the more evangelical church networks in the United States stated that it needed to become more proactive in regards to this area, only for James Dobson to turn around and attack them stating that enviromentalisim was a distraction from getting people saved and abortion! I think that is maddness.

My experiance tells me that Green is onto something when he points out that how we view the rapture (whether it's true or not) has had some real far reaching negative impact's on our behaviour's as Christ's ambassadors.