174 petawatts (PW) of energy, in the form of solar radiation, hits our atmosphere. Almost one-third of this is reflected into space. The rest, 3,850,000 Exajoules(1EJ=1000000000000000000 J) every year, is absorbed by the atmosphere, clouds, oceans and land – one hour of insolation is the equivalent to more than the world’s energy consumption for an…