according to our friendly neighborhood environmental nazis...

traveling is a sin:
http://travel.guardian.co.uk/article/2007/may/06/travelnews.climatechange?print

you are a virus:
http://www.news.com.au/story/0,23599,21684156-5009760,00.html

your babies are bad for the environment:
http://www.businessandmedia.org/articles/2007/20070506180903.aspx