The climate change from distant history is attributable, above all, to the fluctuations of Earths orbit, Suns cycle and volcanic activity. These processes continue, but their influence on the observed climate change is generally too insignificant to explain the current situation (studies show that, for example, the Sun may be responsible for not more than 10 percent of the current global warming.

The key element is the activity of humans who, since the beginning of the industrial revolution (around 1750), started to affect the natural environment on global scale: deforestation and burning of fossil fuels – the CO2 concentration in the atmosphere increased by 30 percent compared to the pre-industrial era (in the prehistoric times the concentration was invariable) and – according to the studies on glacier cores – it is currently the highest since 650,000 years.
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