But the need for more research should not be an excuse for delaying much needed action now. There is already a clear case for precautionary action at an international level. The IPCC tells us that we can’t repair the effects of past behaviour on our atmosphere as quickly and as easily as we might cleanse a stream or river. It will take, for example, until the second half of the next century, until the old age of my grandson, to repair the damage to the ozone layer above the Antarctic. And some of the gases we are adding to the global heat trap will endure in the Earth’s atmosphere for just as long.
The IPCC tells us that, on present trends, the earth will warm up faster than at any time since the last ice age. Weather patterns could change so that what is now wet would become dry, and what is now dry would become wet. Rising seas could threaten the livelihood of that substantial part of the world’s population which lives on or near coasts. The character and behaviour of plants would change, some for the better, some for worse. Some species of animals and plants would migrate to different zones or disappear for ever. Forests would die or move. And deserts would advance as green fields retreated.
Many of the precautionary actions that we need to take would be sensible in any event. It is sensible to improve energy efficiency and use energy prudently; it’s sensible to develop alternative and sustainable and sensible … it’s sensible to improve energy efficiency and to develop alternative and sustainable sources of supply; it’s sensible to replant the forests which we consume; it’s sensible to re-examine industrial processes; it’s sensible to tackle the problem of waste. I understand that the latest vogue is to call them ‘no regrets’ policies. Certainly we should have none in putting them into effect.
And our uncertainties about climate change are not all in one direction. The IPCC report is very honest about the margins of error. Climate change may be less than predicted. But equally it may occur more quickly than the present computer models suggest. Should this happen it would be doubly disastrous were we to shirk the challenge now. I see the adoption of these policies as a sort of premium on insurance against fire, flood or other disaster. It may be cheaper or more cost-effective to take action now than to wait and find we have to pay much more later
~ The Iron Lady, 6 November 1990
Link via John Quiggin (yes my title was ironic)