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Is climate change man-made?

Couldn't it be explained by natural causes? And why is there some controversy over this? 

It is very unlikely that the 20th-century warming can be explained by natural causes. The rapid warming during the last 100 years is consistent with the scientific understanding of how the climate should respond to a rapid increase in greenhouse gases, like that which has occurred over the past century. Additionally, the warming is inconsistent with the scientific understanding of how the climate should respond to natural external factors, such as variability in solar output and volcanic activity.

Numerous experiments have been conducted using climate models to determine the likely causes of the 20th-century climate change. These experiments indicate that models cannot reproduce the rapid warming observed in recent decades when they only take into account variations in solar output and volcanic activity. The human influence on climate very likely dominates over all other causes of change in global average surface temperature during the past half century.