The surface of the earth receive roughly 10 000 times the world energy demand. Of course it is not always sunny, but Solar Panels can store the energy. This way we will be able to answer to the demand of energy of everybody, without injuring the planet. All of this has been possible, because of the price which has been going down every single day since decade.
This kind of energy is pretty convenient, but takes a lot of spaces. It will be possible to install Solar Panels on roof top and some other place. We really need to find a solution and Solar Panels could be a really good way to protect our planet.