Melting point: could 'cloud brightening' slow the thawing of the Arctic?

The climate emergency is prompting some scientists to suggest extreme measures. But whether you call it geoengineering or biomimicry, others feel interfering with nature will have too high a costLike the apocryphal frog that doesn't notice the rising water temperature until it's boiled alive, we as a global society are still struggling to recognise that anthropic global warming is hastening us towards irreversible environmental and ecological catastrophe. While there is consensus among climate scientists about the urgency of the situation, and widespread political acknowledgment that the use of carbon fuels must be reduced, targets have not been met and as the UK's Cop26 president, Alok Sharma, said, the lack of progress at this month's Cop27 demonstrates the 1.5C limit is on "life support" and there is growing evidence that we are further along the road to a tipping point than previously thought.So advanced is this process that some scientists are beginning to argue that merely cutting carbon is not enough and an emergency measure involving what is known as geoengineering is called for. There have been a number of plans suggested, some more outlandish than others. They range from building giant mirrors in space to reflect away sunlight to painting the roofs of buildings white to help counteract heatwaves in cities. Continue reading...