In a press release of importance almost equal to the termination of Microsoft support for WinXP, PC Advisor also says that McAfee has officially announced that SPAM Email Causes Global Warming

"The McAfee report, which was written by consulting company ICF International, said the estimated 62 trillion spam emails that get sent each year consume 33 billion kilowatt hours of electricity, enough to power 2.4 million homes. In addition, spam email releases as much carbon dioxide into the atmosphere as 3.1 million cars consuming 2 billion gallons of gasoline."

The McAfee report (.pdf)

John