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It would be naive to assert that man has no impact on the climate whatsoever, Castiel, especially by using the weather conditions of a small period to corroborate one's belief. Carbon dioxide emissions in recent history reached 380 parts per million, which is unprecedented in the last 800,000 years, and a continued warning trend was experienced after the middle-later part of the 20th Century, which coincides with the flourishing of 'Tiger economies' in Asia and increased affluence in the USA and subsequently the rest of the Western World. The world would have warmed up following the Little Ice Age from 1450-1850, but, given that the later part of this period was characterised by rapid industrialisation, it seems likely that increased carbon dioxide emissions and higher average temperatures prematurely ended this cold period. Also, the reason why their may have been no high temperatures during that period you are referring to is because, paradoxically, global warming can trigger cooling by activating a negative feedback mechanism that negates the original temperature change. Increased CO2 emissions retain greater infrared radiation being re-radiated from the Earth's surface and so lead to some increase in temperature, but this heat causes melting, namely of the Arctic,Greenland and parts of the Antarctic ice sheets. The thawing of Greenland ice has led,and will continue to lead to,fresh water making contact with the Gulf Stream, thereby causing the density of the sinking water to decrease due to its dilution by fresh water and so reducing the rate if the cold return current at the bottom of the Atlantic. This means that the rate at which warm water is cycled back up to the North Atlantic is reduced, which creates relatively cold conditions.