The impact of volcanoes
Figure 1: The explosive eruption of Mount Pinatubo in 1991. ©U.S. Geological Survey. Department of the Interior/USGS.
Figure 2: A comparison on the amount of carbon dioxide emitted per day by the eruption of Eyjafjallajökull compared to the amount saved by the reduction in aeroplane flights as a result of the eruption’s ash cloud © Planes or Volcano? David McCandless, Ben Bartels, Information is BeautifulA more dramatic change in albedo is associated with the ‘snowball Earth’ hypothesis. It’s been suggested that during the Proterozoic (850-630 million years ago), the positive albedo feedback associated with ice accumulation led to ice covering the whole Earth. In this scenario, volcanoes and the huge amounts of greenhouse gases they can emit, would be necessary to warm the Earth again.In the next Step, we’ll look at greenhouse gases and how their concentration has been changing in the atmosphere.
Come Rain or Shine: Understanding the Weather
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