Sir - Andy Boddington's eloquent response (Letters, November 16) to Michael Tyce, claiming that climate impacts "will be virtually imperceptible", is like a breath of fresh air.

Ironically Mr Tyce added that "a cause which relies on untruths can never be just" followed by "the IPCC still find it only "likely" that man is accelerating natural warming - their most doom-laden forecast has temperatures rising by 0.02 degrees per year and sea-levels by a foot a century."

Mr Tyce, who is the source of untruths? The IPCC has raised its "likely" (meaning 66 per cent certain) to "very likely" (90 per cent certain). Their most doom-laden assessment of temperature rise (6.1C by 2100) is 228 per cent larger than the figure selected by Mr Tyce. There is a similar mismatch for sea-level rise. The chairman of the IPCC, Dr R K Chaudri, said (Valencia, November 17) "Climate change is a serious threat to development everywhere. Today, the time for doubt has passed. The IPCC has unequivocally affirmed the warming of our climate system, and linked it directly to human activity".

He indicated "metres of sea-level rise" and "20-30 per cent of species at increased risk of extinction".

With doubts cast aside, let us hope that the "species at risk" include dinosaurs. Nestling in Oxfordshire's Jurassic landscape is the biggest dinosaur of all, Didcot A Power station, determined to landfill vast quantities of ash into Radley Lakes. If they recycle all their ash as cement, they can save, potentially, up to 1.5 million tonnes of CO2 through avoidance of manufacturing cement from limestone and coal. How can we accept such huge CO2 production while as individuals we struggle to reduce our carbon footprint to below ten tonnes per year each?

Peter Harbour, Abingdon