Waste of Energy
If Greenpeace and Google were really serious about going green then all these two groups have to look at is all the wasted heat that is generated every day and escaping into the air at factories that either burn fuel to operate or factories that produce energy. Flaring off is a good example as are plants such as they have in Canada that produce steam to force Bitumen to the surface in Alberta. Coal fired plants release vast amounts of energy (waste) in the air.
That wasted heat could and the technology is here today to produce more power from the waste that is escaping.