This week, Sir Nicholas Stern's report on the economics of global warming will warn of dire effects on our economy, comparable to the world wars and the great depression, unless action is taken to prevent climate change.
The former World Bank economist was commissioned by the Treasury to examine the economic impact of climate change.
He'll argue that if governments spend large sums of money now to reduce carbon emissions, the dividends in the future will be colossal.
Peter Ainsworth
Peter Ainsworth is the Conservative environment spokesman
The Environment Secretary, David Miliband, appears to need no convincing.
In in a leaked letter to the Chancellor, Gordon Brown, Mr Miliband has proposed a package of environmental taxes designed to encourage people to use public transport, buy smaller cars and fly less.
What would the Conservatives do to save our economy and, indeed, the planet?
We put the question to the party's shadow environment minister Peter Ainsworth.