The Greens have proposed an interim carbon tax for Australia. The basic idea is that there would be a carbon tax of $20 for two years, and in that time, policy decisions on an ETS would be made. The details are here. Professor Garnaut made a similar proposal in the Garnaut Review.

This is a very sensible idea. A big issue with carbon pricing policy is that before a carbon price is introduced, there is a very strong incentive for polluters to act like the sky will fall in. This is because they know that would lead to weaker policy, or more compensation, or both. This creates a very bad environment for a government to make decisions about targets, especially about targets for the next ten years or longer. Introducing a carbon price first is a much wiser way to go about things.

This would probably be a good idea in the US as well. Getting climate legislation through the US Senate is very difficult, and will become more difficult now that the Republicans have an extra senator. It may be easier to introduce a low carbon tax now (possibly equal to the price floor in the proposed US legislation), and then introduce a cap on emissions later. Australian policy could show the way forward for US policy.

Good climate policy provides certainty for investors in low emission technology. When a cap is introduced, it could be possible to maintain the current price as a floor in carbon price.

Update: This architecture has been adopted for Australia’s proposed carbon price mechanism.