Professor Bryan Hoskins put it very nicely on this morning’s Today programme: it may be possible to treat a help a fat man with pills, but its best to do try and help him with his diet and exercise regime first.

BBC NEWS | Science & Environment | Engineering Earth ‘is feasible’
A UK Royal Society study has concluded that many engineering proposals to reduce the impact of climate change are “technically possible”… It is an unpalatable truth that unless we can succeed in greatly reducing CO2 emissions, we are headed for a very uncomfortable and challenging climate future. Geo-engineering and its consequences are the price we may have to pay for failure to act on climate change… [more]