SIR - The Prime Minister is wrong to suggest that we have up to 15 years to tackle climate change.

Carbon and methane produced now won't take effect for a few more years and so the damage has already been done.

The current rapid melting of the Greenland ice sheet and the worst drought ever in Australia are the result of emissions decades ago, so time has probably run out already.

Mr Blair would be more convincing if his government gave proper support to domestic renewable energy schemes rather than allowing the subsidy scheme, of a paltry £3 million, to be used up halfway through the year.

Keith Thomson, Heights Lane, Bradford