Guardian: Internet users have long known that spam emails – offering everything from cheap medicines and sex aids to get-rich-quick schemes – are an unwanted annoyance, but new research suggests that they are also hugely damaging to the environment. More than 80% of the world’s email traffic is now spam and the transmission and receipt of unwanted email gobbles up 33bn kilowatt-hours of electricity a year, according to anti-virus software specialist McAfee. That is the equivalent of the …