Greg Sheridan was upset about my piece in the Fin, attacking his claim that the effects of Australian action on climate change will “will have an impact on the global environment so tiny it will be unmeasurable.” I’ll respond to the details of his objections over the fold, but let’s first tackle the substantive question. Australia is currently responsible for a about 2 per cent of global emissions. Under business as usual projections, our emissions were expected to grow by 20 to 30 per cent between 2000 and 2020. If we achieve the target of 5 per cent below 2000 emission, that implies a reduction of 25 per cent relative to business as usual, 0.5 per cent of global emissions. That’s about 1 per cent of what is needed if the world is to cut total emissions by 50 per cent over the next couple of decades, as is necessary in a stabilisation scenario.
That’s a small step that is not going to solve the problem, but neither is it “so tiny as to be immeasurable”. In fact, it’s pretty typical of Australia’s weight in international affairs – small relative to the big players like the US and China, but large relative to our share of world population. As a comparison, Australia currently has about 1500 troops in Afghanistan, out of a total (ISAF and Afghan army) force of over 150 000. Would Sheridan want to argue that, since our troops are less than 1 per cent of the total, their effects are so immeasurably small that we might as well do nothing[1]. Well, no. It appears that Australia is immeasurably tiny only when we are doing things US Republicans don’t like.