Friday 3 December 2010

Stuck in the house

Stuck in the house again, a replay of last winter.
When we moved from Dorset to Bucks, 18 years ago, it snowed on the day we moved in (in April), David was delighted because he hadn't seen much snow before,and I don't remember conditions like this here.
Perhaps we need to think a bit harder about global warming. Maybe it's not all bad.
I read somewhere that the start of the new Ice Age coincided with early man's mass burning of the forests to clear the land for farming which created sufficient co2 to stop the big freeze happening.
In the past Ice Ages have lasted anything from 80,000 to 100,000 years, with the intervening interglacials being much shorter, 10,000 years at most. We've now been ice free for 14,000 years.

"scientists used ice cores to decipher past changes in temperature, they also analysed the gaseous composition of trapped air bubbles in the ice. Such analysis revealed that during the last Ice Age, levels of carbon dioxide in the atmosphere were significantly lower than they were before mankind began polluting the atmosphere.
In fact, reconstructed records of temperature and atmospheric carbon dioxide were found to match almost exactly. Since carbon dioxide is a significant greenhouse gas, it is believed that initial climatic changes resulting from orbital variations were somehow affecting the composition of the atmosphere, to the extent that a lowering of carbon dioxide concentrations was increasing the global cooling."


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