"Environmental catastrophism" is a red herring. The real question is how high a priority we should give to environmental struggles.

More... (http://mrzine.monthlyreview.org/2014/angus140714.html)

If the environmental crisis is as serious as the best science says, then a "politics of transformative change" that doesn't place a high priority on resisting capitalism's war on the planet will be unable to carry through any serious change at all.

Well and good, but if your 'transformative change' is anything short of ending capitalism then you're spinning your wheels. Attack the disease organism not the symptoms.