Whether or not it applies directly to Katrina, The Guardian did look at the politics of suppressing science related to global warming:
Some of America’s leading scientists have accused Republican politicians of intimidating climate-change experts by placing them under unprecedented scrutiny.
A far-reaching inquiry into the careers of three of the US’s most senior climate specialists has been launched by Joe Barton, the chairman of the House of Representatives committee on energy and commerce. He has demanded details of all their sources of funding, methods and everything they have ever published.
Mr Barton, a Texan closely associated with the fossil-fuel lobby, has spent his 11 years as chairman opposing every piece of legislation designed to combat climate change.
In other environmental news today, the BBC reports on how human action is increasing the size of the hole in the ozone layer.