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Roughly 1,000 years ago, Europe enjoyed several centuries of balmier average temperatures. Dubbed1 the "Medieval Warm Period," it was the last time before the present that agriculture could flourish in Greenland. This era also provided fodder2 for countless3 misunderstandings about the nature of present day global warming.
New research shows that the MWP, as it is affectionately known in acronym-happy science circles, as well as the "Little Ice Age" that almost immediately followed it were likely the result of fluctuations4 in the sun's strength and the frequency of volcanic5 eruptions6, among other natural causes.
Cores drilled from ancient ice sheets as well as of the coral reef and lake sediment7 varieties show that at the same time as Europe enjoyed average temperatures as warm as today, the tropical Pacific was unusually cold. This suggests that natural cycles forced these climate anomalies.
Unfortunately, neither the sun nor other natural cycles can entirely8 explain the recent warming trend that has brought agriculture back to coastal9 Greenland. To date, the only explanation that matches those observations are a concurrent10 rise in greenhouse gas concentrations in the atmosphere.
CO2 and its peers are now responsible for trapping an extra three watts11 per square meter of planet. And if that continues, the MWP will end up looking like an ice age.
1 dubbed | |
v.给…起绰号( dub的过去式和过去分词 );把…称为;配音;复制 | |
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2 fodder | |
n.草料;炮灰 | |
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3 countless | |
adj.无数的,多得不计其数的 | |
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4 fluctuations | |
波动,涨落,起伏( fluctuation的名词复数 ) | |
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5 volcanic | |
adj.火山的;象火山的;由火山引起的 | |
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6 eruptions | |
n.喷发,爆发( eruption的名词复数 ) | |
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7 sediment | |
n.沉淀,沉渣,沉积(物) | |
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8 entirely | |
ad.全部地,完整地;完全地,彻底地 | |
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9 coastal | |
adj.海岸的,沿海的,沿岸的 | |
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10 concurrent | |
adj.同时发生的,一致的 | |
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11 watts | |
(电力计量单位)瓦,瓦特( watt的名词复数 ) | |
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