Global warming

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OK, maybe this has been discussed many time before on mylot, but I am just curious. Some people say that it is a hoax, some say that we are being scared unneccesarily, while many say it is a genuine threat. Now, going by the weather fluctuations...I can conclude that our planet is not going the right way. Is the doomsday certainly near?? We really have got 10 years to spruce up our act??? Who is to blame....the past industrial revolutions of the present day developed countries....or the attempts of the developing nations???