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Geology
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The last 80 years the global mean of temperature has been rising. Is that the "El Nino" occurrence, the ozone layer depletion, or are we headed into another era where the overall climate of Earth is warmer? explain your answer

Apr 19th, 2015

El Niños are not caused by global warming. 

Clear evidence exists from a variety of sources (including archaeological studies) that El Niños have been present for thousands, and some indicators suggest maybe millions, of years. However, it has been hypothesized that warmer global sea surface temperatures can enhance the El Niño phenomenon, and it is also true that El Niños have been more frequent and intense in recent decades. Whether El Niño occurrence changes with climate change is a major research question.

The ozone hole does not directly affect air temperatures in the troposphere, the layer of the atmosphere closest to the surface.

Although changes in circulation over Antarctica related to the ozone hole appear to be changing surface temperature patterns over that continent. Ozone is actually a greenhouse gas, and so are CFCs, meaning that their presence in the troposphere contributes slightly to the heightened greenhouse effect. The main greenhouse gas responsible for present-day and anticipated global warming, however, is carbon dioxide produced by burning of fossil fuels for electricity, heating, and transportation.

Apr 19th, 2015

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