Carbon pollution: reduction scheme or soft option?

Source: Australian Review of Public Affairs
"Concessions to major polluters undermine the effectiveness of the government’s proposed emissions trading scheme by delaying indefinitely any carbon reduction. Environmentalists have attempted to persuade the government to change its policy, but these efforts are unlikely to succeed. So why is the government, which is apparently committed to action on climate change, about to introduce a policy that won’t work? And what might make them change tack?"