Sir - "Like the reds before them, the greens seek state control of our lives", writes Michael Tyce (Letters, December 21). Poppycock. The Greens have consistently advocated greater decentralisation of state power to regional and local government.

Certainly, since austere times are likely as oil begins to run out, we think greater regulation and a strengthened welfare state will be needed, but a more appropriate analogy is with the wartime government of national unity rather than the command economy of the communists: the greens are not reds.

Public subsidy for solutions to climate change is desirable, not reprehensible (we note that the current so-called "free market" sees no problem with subsidising oil companies, the nuclear industry, air travel etc. through tax concessions or treasury handouts).

Sustainability is essential to our society's survival. Perhaps that is why left, right and centre all now look to the Greens for inspiration for the politics of the future.

John Coleman, Oxford