Efforts to reduce greenhouse gas emissions in a single country will usually lead to increased emissions in other countries – a phenomenon called carbon leakage (for simplicity, I will use the term carbon leakage although the same outcome also applies to other greenhouse gases). Various mechanisms contribute to this effect:
- If climate policy increases production costs, this will reduce the competitiveness of domestic production relative to countries without or with a laxer climate policy. Consumers will shift their purchasing to the cheaper imported alternatives. The effect will be that some emissions-producing production will shift to third countries with the laxer climate policy – the competitiveness channel.
- If climate policy in a single country reduces consumption of fossil fuels (for example, through a carbon levy), this will lower the world market price of fossil fuels a little, which will encourage increased consumption in third countries – the fossil fuel channel.