In American politics, the Republican Party's commitment to the fossil-fuel industry means that it will continue to deny climate science and favour policies that exacerbate global warming.

The US government has announced it will not list the Pacific walrus as a threatened species based on diminished Arctic Ocean sea ice, concluding that the marine mammals have adapted to the loss.

The inadequate response to Katrina is due to a failure to heed the danger signs, writes Ron Fournier.