I need two sides of 5 Environmental Issues. For an example for Off
shore oil drilling the two sides would be disturbances of the
biosphere, high oil spills risk and such vs. money, jobs, energy
source etc.

I would also appreciate if you can include your sources so I can
research each topic further.

I am delighted to learn that my suggestion of the Debatabase was
useful to you. I've reposted the link below. This is a very useful
site that is sponsored by the International Debate Education
Association. The range of topics is broad, and the number of subjects
within each topic is impressive.

Debatabase - Environment and Animal Welfare
http://www.idebate.org/debatabase/theme.php?dbTheme=11

You might find these sites to be of interest as well:

An Internet Hotlist on Environmental Resources 
http://www.kn.sbc.com/wired/fil/pages/listenvironmms2.html

YouDebate: Environment Debates and Polls 
http://www.youdebate.com/ENVIRONMENT.htm

My Google search strategy:

Google Web Search: debate topic environment
://www.google.com/search?hl=en&lr=&q=debate+topic+environment

Best regards,
pinkfreud

You might want to look through topics in the Debatabase:

http://www.idebate.org/debatabase/theme.php?dbTheme=11

Pinkfreud you Rock! This will work perfectly. :-)

I'm sorry to see that you were not fully satisfied. In the future,
please remember that if a Researcher has not given you everything you
need, you can request clarification before rating the answer.