Leaders: We must get heated about global warming

Faced, as many people are, with immediate worries about jobs and incomes, it is understandable that doing something about climate change has slipped down mental agendas.

But the latest report from the International Panel on Climate Change (IPCC), which works under the auspices of the United Nations, says that everybody needs to broaden and lengthen their horizons.

They are not wrong. There are still those who believe either that the world is not getting warmer or that if it is, it is due to natural factors such as solar activity cycles. That stance flies in the face of the vast majority of scientists. This report states that those who have studied the phenomenon are now 95 per cent certain that global warming is happening and that man’s activities are responsible.

It has to be said that it does not help matters that the picture painted by the IPCC is apocalyptic. It says that climate change threatens to raise sea-levels rather faster than previously thought, portending that many coastal cities – from the rich like New York to the poor like Mumbai – may, within a few decades, become uninhabitable. It raises concerns about supplies of fresh water, essential not just for drinking but also for the growth of food. Less land, less fresh water, but more people – it is a dread prospect.

Among the anti-climate change theories rebutted by the report is that the last 15 years, which have seen global temperatures remain relatively stable, is evidence that warming is not happening. The scientists say, quite reasonably, that in global historical terms of a habitable planet being around for several million years, a decade and a half is the blink of an eye.

They also point out that each of the past three decades has been warmer than the previous one and that the earth is now warmer than it has been in the last 1,400 years. And, they say grimly, even just halting the amount of greenhouse gas people put into the atmosphere won’t halt the change; a sustained reduction for years to come is required.

Will people heed the warning? Well, this week saw the Labour leader, Ed Miliband, bidding to be prime minister by promising to cap energy bill price rises, ignoring the fact that part of those increases are due to the cost of converting energy production to more expensive low-carbon means.

An effect of such a policy may be to cut investment in renewables. But just as all are now paying for the costs of past financial profligacy, so all must also face up to paying for the costs of carbon overindulgence.

Even if not totally convinced by the scientific evidence, surely the prudent