The movie is CHAIN REACTION : The problem has been too little energy but what happens when everyone has TOO MUCH available energy? What if you gave 7 x 10^9 people a FREE KW of energy, IMMEDIATELY they would DEMAND a FREE MW, then GW...where does all the WASTE HEAT go? You see, you naively think that all the energy(lights, motors, etc)you use just "goes away". It doesn't "go away", it becomes lower WASTE HEAT, thermal garbage if you will. And the ONLY way our biosphere gets rid of WASTE HEAT is via blackbody radiation to space(no conduction/convection). Thus the current developments in new energy sources HAS to be controlled rationally, or we all COOK......This may be an extreme example but consider the fruit fly analogy : the earth is made of green cheese and you introduce 2 fruit flies that reproduce every 1/2 hour. At that 2^168x2 rate, in one week the earth becomes a solid mass of FRUIT FLIES. But in actual fact they'd COOK themselves long before that, from WASTE HEAT. We could easily become those "fruit flies".....bottom line : either a BALANCED energy input = output or we go extinct like 98% of all species that have ever lived on the earth-stage...tomorrow's DIRT.