Global warming as a natural process

Everywhere one is reading that climate change is caused by humans. Are the humans the only ones to be blamed? No, because there are some natural causes that have been responsible for the climate changes in the past, too. How big the effect of the natural causes on the climate this time is, shouldn’t be discussed here. But in the following text I’m going to explain some of these natural causes.
First, there
are the volcanoes. A volcano can erupt big amounts of sulphur dioxide (SO2) and water vapour. The sulphur dioxide reaches the upper levels of the atmosphere and forms there together with water droplets sulphuric acid. Sulphuric acid in the atmosphere reflects the sunlight and therefore it screens the earth from some solar energie. So volcanoes can cause immense cooling. With having a global
warming and not cooling they are not important this time.
Second, the oceans cover over 70% of the earth. The oceans move huge amounts of heat and absorb much more of the sun’s radiation as the atmosphere or the landmasses. The heat is released from the oceans in form of water vapour. And water vapour has a huge effect on the greenhouse effect.
Third, there is the continental drift. The continents
weren’t always as we know them today. Once there was one big huge continent but it got divided a long time ago. The dritfting of the continents is still going on, e.g. India is still crushing into Asia and thus the Himalaya is still getting higher. This moving of the continents has an impact on the climate because it’s changing the positions of the landmasses and the flow of the oceans
and therefore the winds.
It is believed that these three causes had an impact on the climate at the end of the last Ice Age. So one better shouldn’t forget them because they are still important.

Jenny am 29.3.09 18:13

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