Climate change in the resent past

Global average CO2 concentrations were fairly constant till 1930. There was a little “Ice Age” in the period 1400-1900. Ever since industrialization, however,CO2 levels in the atmosphere have been going up and, as a result, global temperature.
Since 1960, a close watch has been kept on CO2 levels in the atmosphere. The total global emission of CO2 was 27.2 billion tons.
Global concentrations of CO2 reached the highest level in 2007, since record-keeping began in 1958, according to the World Metrological Organization. According to it, samples from 40 countries revealed that the level of CO2 in the air reached 381 ppm, a concentration not seen in 400000 years. The industrial revoltion, in particular, caused a rapid rise of CO2.
Global warming of 0.2 C per decade is highly likely, resulting in global average projected warming of 2.2 C TO 4 C by the end of the current century.
Climate change threatens to ruin cultivable land, resulting in a crop failures. It will lead to rise in sea levels, which will threatens the coastal infrastructure. Glaciers are melting globally.
Melting of glaciers will also lead to reduced summer flow. These are no longer abstract and remote concept.
There are changes in amount and pattern of precipitation, resulting in increases in frequency and intensity of the extreme wheather, including hurricanes. This will lead to various effects, including the changes in agricultural yields. Global warming will also lead to the extinction of many species. There will be rise in number of diseases – malaria,dengu,fever etc. Apart from the increasing the average temp of the atmosphere, the build-up in CO2 concentration in the atmosphere is also in water to produce acid, which, in turn, is decreasing the ph of the oceans.