Can somebody come out with any man-made reasons for earlier occurances of global warming, sever floods, etc. We are only imagining man-made reasons for present climate change situation.
In fact, the main reason for the climate change may be due to global warming caused by other natural, earthly and solar events such as eruption of volcanoes, 11 year cyclic sun storms, etc. However, one can only try to minimize the contribution from man-made activities for global warming such as use of fossil fuels for electricity generation and for fueling transportation vehicles, including aircrafts and space vehicles.
Also, the Global Warming Potential of other greenhouse gases like fluorine compounds, methane, etc is much more than carbon dioxide. Methane is released from the decaying vegitation and is much more potent (
http://icareforyou2007.blogspot.com).
It is difficult to believe that a fractional rise in the ambient and ocean temperature can cause the great meltdown of large Greenland and west Antarctica glaciers.
It is also possible that the actual gravity of the situation was not told seriously to the world in time by the responsible organizations (like IPCC), or there are yet unknown natural reasons such as effect of variations in the geothermal energy for the climate change.