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Predictions That Earth's Axis Will Tilt In 100 Years: Due To Global Warming

by Tanya on August 25, 2009 at 8:38 AM Environmental Health

A new study has dire predictions to attribute to global warming phenomenon. It foresees that the rising temperatures will heat up the oceans to the extent that it could cause Earth's axis to tilt in the coming century.

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According to a report in New Scientist, the warming effect was previously thought to be negligible, but researchers now say the shift will be large enough that it should be taken into account when interpreting how the Earth wobbles.

The Earth spins on an axis that is tilted some 23.5 degrees from the vertical. But this position is far from constant - the planet's axis is constantly shifting in response to changes in the distribution of mass around the Earth.

"The Earth is like a spinning top, and if you put more mass on one side or other, the axis of rotation is going to shift slightly," said Felix Landerer of NASA's Jet Propulsion Laboratory in Pasadena, California.

The changing climate has long been known to move Earth's axis. The influx of fresh water from shrinking ice sheets also causes the planet to pitch over.

Landerer and colleagues estimate that the melting of Greenland's ice is already causing Earth's axis to tilt at an annual rate of about 2.6 centimetres - and that rate may increase significantly in the coming years.

Now, they calculate that oceans warmed by the rise in greenhouse gases can also cause the Earth to tilt - a conclusion that runs counter to older models, which suggested that ocean expansion would not create a large shift in the distribution of the Earth's mass.

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Predictions That Earth's Axis Will Tilt In 100 Years: Due To Global Warming

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