While the immediate effort must go into addressing the human and
environmental consequences, over the longer term Katrina has many
lessons to offer and should be seen as a wake-up call about the dangers
of continued global fossil fuel dependency.
Greenpeace believes that as the water is pumped from New Orleans and
the city is rebuilt a parallel effort should be made to wean the US,
and the world, from its fossil fuel addiction, an addiction which fuels
global warming and which will cause much more coastal flooding and many
more extreme weather events.
Switching to renewable energy sources, which do not contribute to
global warming, would also protect against future economic and energy
security shocks like those suffered after Katrina. While much
discussion can be made about whether or not global warming contributed
to the severity of Katrina what the world's climate scientists do know
is that the burning of fossil fuels will likely increase the number and
severity of extreme weather events.
What does Katrina have to tell us about Global Warming? Here's an excellent technical discussion of the issue from RealClimate.org and a more general piece from the Los Angeles Times.
More about Katrina's toxic impacts from Greenpeace USAIndex of archived stories from Greenpeace about toxics and toxic hotspots in Louisiana.