Fortunately it also means more hands and more minds to take up the twin challenges of improving efficiency and of developing new energy sources. Solar energy, stored as fossil fuels or renewed daily as wind, sun and water power, is not the only source of energy in the universe, or on earth. One important source that is just in its infancy on earth is the same source that earth's sun and all of the other stars in our universe use. The energy inherited from the Big Bang. On earth it is called nuclear energy.
Nuclear energy comes in two forms, fission and fusion.
In nuclear fission, humans tap the energy of the atom that is stored in very heavy atoms like uranium and plutonium. They do this by bombarding these heavy atoms with high speed particles until they break apart. If you let it accelerate you get a very destructive explosion as happened to end that second World War. If you control the chain, as is done in nuclear energy plants around the world today, you get useful heat which is used to boil water, which is used to create electricity. Here, too, there are side effects that worry human managers on earth.