Wow! Fascinating post by Martin Varsavsky. Excerpt:

Computing also requires enormous amounts of electricity. Every new chip developed requires more and more energy to function. If present trends continue computing and computing use and interconnection will soon make up 20% of all our electricity needs up from a current 7%. The person who brought this to my attention was Larry Page. During a session at CGI I asked Larry what he thought were Google´s limit to growth. His surprising reply was: electricity. Google he explained to me is by now the world´s largest owner of computers and therefore the internet´s biggest electricity user. This Larry said was of great concern to him and he was looking of ways to make Google carbon neutral.