Monday, April 13, 2009

Global warming, again

What is the optimal climate for humans? That would seem to be an important question and a question that should be answered well before panicking about changes in the climate — whether real or imagined, whether warming or cooling. Matt Patterson reminds us that climate does change and that warming isn't the worst that can be imagined:
  • Around the 3rd century B.C., the planet emerged from a long cold spell. The warm period which followed lasted about 700 years, and since it coincided with the rise of Pax Romana, it is known as the Roman Warming.
  • In the 5th century A.D., the earth’s climate became cooler. Cold and drought pushed the tribes of northern Europe south against the Roman frontier. Rome was sacked, and the Dark Ages commenced. And it was a dark age, both metaphorically and literally — the sun’s light dimmed and gave little warmth; harvest seasons grew shorter and yielded less. Life expectancy and literacy plummeted. The plague appeared and decimated whole populations.
  • Then, inexplicably, about 900 A.D. things began to warm. This warming trend would last almost 400 years, a well documented era known as the Medieval Warm Period. Once again, as temperatures rose harvests and populations grew. Vineyards made their way into Northern Europe, including Britain. Art and science flourished in what we now know as the Renaissance.
  • Then around 1300 A.D. things cooled drastically. This cold spell would last almost 500 years, a severe climate event known as the Little Ice Age. Millions died in famine as glaciers advanced all over the world. The plague returned. In Greenland, the Norse colony that had been established during the Medieval Warming froze and starved. Arctic pack ice descended south, pushing Inuit peoples to the shores of Scotland. People ice skated on the Thames; they walked from Staten Island to Manhattan over a frozen New York Harbor. The year 1816 was remembered as the year without a summer, with some portions of the Northern Hemisphere seeing snowfall in June.
  • But around 1850 the planet began to warm up yet again. Glaciers retreated. Temperatures rose. This is the warming period which we are still enjoying today. And once again, the warmth brought bounty: The last 150 years have seen an explosion in life expectancy, population, and scientific progress like never before. [more]
A little knowledge of history almost always helps put things into perspective.

Thanks to Power Line for the reference.

Pajamas Media » No SUVs Around During the Roman Global Warming ‘Crisis’

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