Green tariffs: what are they and why do they matter?

Cutting carbon places costs on industries such as steelmaking that rely heavily on fossil fuels. Photograph: Dean Lewins/AAP

Why are we talking about green tariffs?

Cutting carbon places costs on some industries, particularly those that rely heavily on fossil fuels at present, such as steelmaking, or that emit carbon as part of their processes, such as cement and concrete production.