Oceans warmed by the rise in greenhouse gas levels could cause the Earth’s axis to tilt, according to a new study by NASA’s Jet Propulsion Laboratory. Researchers say the tilt would be significant enough to create a large shift in the distribution of the Earth’s mass, especially when combined with the tilt being caused by the melting of Greenland’s ice.
From New Scientist:
The researchers modelled the changes that would occur if moderate projections made by the Intergovernmental Panel on Climate Change – a doubling of carbon dioxide levels between 2000 and 2100 – were to become reality.
The team found that as the oceans warm and expand, more water will be pushed up and onto the Earth’s shallower ocean shelves. Over the next century, the subtle effect is expected to cause the northern pole of Earth’s spin axis to shift by roughly 1.5 centimetres per year in the direction of Alaska and Hawaii.
Luckily, the effect is expected to be relatively small, and shouldn’t induce any negative feedback in the planet’s climate. It just needs to be taken into account when interpreting shifts in Earth’s axis.
Still, this should be a strong message to those who still insist that we insignificant little humans can’t affect the planet we live on to a great extent. We may be relatively unimportant in the scheme of things, but that doesn’t mean we aren’t capable of causing some serious changes.
Link [New Scientist]
Photo credit: Wikimedia Commons
