Planet Earth is warmer than it has been for at least 2,000 years, according to a study that took its temperature from 692 different “natural thermometers” on every continent and ocean on the planet.
In the most comprehensive assessment of how the climate has changed over the period to date, researchers looked at a host of sources of historic information, including tree rings, ice cores, lake and sea sediments, corals, mineral deposits and written records.
What they found confirmed the famous “hockey stick” graph, showing an undulating, but broadly flat, line followed by a sharp uptick that begins at around 1900.
The only plausible explanation for this sudden change is fossil fuel emissions, which have increased the level of carbon dioxide in the atmosphere from about 280 parts per million in the 19th century to more than 400 today.
Full story at http://ind.pn/2uSnOxu
Source: Independent
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