Age: CLIMATE change will be one of the issues that defines the Rudd Government. It is an issue of tough choices, of clashing values and objectives, in which decisions will have to be made in a fog of uncertainty about how serious the problem is, and what is the best way out of it. But those choices must be made. Rudd rode to power partly on concern over global warming. Labor promised to act decisively, not only on the symbolic step of ratifying the Kyoto protocol, but on the serious stuff: …