The Guardian/UK — We need to get prepared for four degrees of global warming, Bob Watson told the Gurdian last week. At first sight this looks like wise counsel from the climate science adviser to Defra. But the idea that we could adapt to a 4C rise is absurd and dangerous. Global warming on this scale would be a catastrophe that would mean, in the immortal words that Chief Seattle probably never spoke, “the end of living and the beginning of survival” for humankind. Or perhaps the beginning of our extinction.

The collapse of the polar ice caps would become inevitable, bringing long-term sea level rises of 70-80 metres. All the world’s coastal plains would be lost, complete with ports, cities, transport and industrial infrastructure, and much of the world’s most productive farmland. The world’s geography would be transformed much as it was at the end of the last ice age, when sea levels rose by about 120 metres to create the Channel, the North Sea and Cardigan Bay out of dry land. Weather would become extreme and unpredictable, with more frequent and severe droughts, floods and hurricanes. The Earth’s carrying capacity would be hugely reduced. Billions would undoubtedly die.

Watson’s call was supported by the government’s former chief scientific adviser, Sir David King, who warned that “if we get to a four-degree rise it is quite possible that we would begin to see a runaway increase”. This is a remarkable understatement. The climate system is already experiencing significant feedbacks, notably the summer melting of the Arctic sea ice. The more the ice melts, the more sunshine is absorbed by the sea, and the more the Arctic warms. And as the Arctic warms, the release of billions of tonnes of methane - a greenhouse gas 70 times stronger than carbon dioxide over 20 years - captured under melting permafrost is already under way.

To see how far this process could go, look 55.5m years to the Palaeocene-Eocene Thermal Maximum, when a global temperature increase of 6C coincided with the release of about 5,000 gigatonnes of carbon into the atmosphere, both as CO2 and as methane from bogs and seabed sediments. Lush subtropical forests grew in polar regions, and sea levels rose to 100m higher than today. It appears that an initial warming pulse triggered other warming processes. Many scientists warn that this historical event may be analogous to the present: the warming caused by human emissions could propel us towards a similar hothouse Earth. (08/10/08)
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Financial Times – Jean-Claude Trichet, president of the European Central Bank, warned on Thursday that third-quarter eurozone growth would be “particularly weak”. This sparked talk that the ECB would be forced to abandon its hawkish policy stance and start cutting interest rates, thereby weakening the euro. …

The dollar hit a five-month high of $1.5055 against the euro and climbed 1.3 per cent to $1.9189 against the pound – its strongest since November 2006.

Traders said the violence of the move was testimony to the extent to which the market had been surprised by economic weakness outside the US.

“Mr Trichet was unable to convince the public that the ECB had not been surprised by the eurozone’s economic downturn,” said Ulrich Leuchtmann at Commerzbank. “Therefore, the last remaining rate hike expectations were taken off the table.”

UK economic data has shown increasing weakness this week; officials in Japan warned that the economy was headed for a recession; and the Reserve Bank of Australia said it was planning to start cutting interest rates to head off an impending economic slowdown. (08/10/09)
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