Well, I guess we need to recognize that climate change is a problem that is caused by all sectors of the economy. We need to put policies in place that are going to address emissions from all sectors of the economy. That would include some form of carbon tax, which is possibly complemented by a cap and trade system.
The first thing we need to do is to address that the market is failing to price carbon emissions. It's what economists call an “externality”. So we have to put a price on carbon, and that can be done either directly through a carbon tax or indirectly through a cap and trade system.
As I said, we also need a whole range of regulations to deal with things like energy efficiency: standards for renewable energy, goals, and quotas for the sales of low- and zero-emission vehicles. I would also say we should have a minimum requirement for a carbon sequestration, to require the oil and gas industry to capture some of the emissions they're producing.
So we need a range of regulatory tools and economic instruments as well as investments in low- and zero-emission technologies. We really need a comprehensive suite of things. Some of those programs could already be done under the Canadian Environmental Protection Act. As I mentioned, the act will need to be amended to make carbon taxes and other environmental taxes available, because they're not currently in the list of economic instruments authorized by CEPA.