Renewable energy is energy generated from a natural resource. The reason these sources are called “renewable” is because they replenish quickly and therefore we have a relatively permanent supply. Resources that cannot be restored in a short period of time are classified as non-renewable. In order to gain a sustainable future, we should not have resources so easily available that cannot be renewed so quickly. Added to this is the fact that the use of chemicals as a source of energy has harmful consequences on the environment. Non-renewable sources 84% ​​of the world's energy comes from non-renewable sources. This creates problems because these sources are not infinite and also have negative effects on the climate and environment. Coal is a well-known non-renewable energy source. Coal is the most widely used energy generator in the world. Coal is a natural resource that comes from underground. Coal supplies are concentrated in industrialized countries (United States, Russia, China and India). Some advantages of using coal as an energy resource are that the infrastructure is already in place and coal produces a high load factor, meaning high power at a relatively low unit cost. Coal reserves are expected to last longer than those of oil and natural gas. Coal is the cheapest form of electricity generation, making it the viable option for developing countries. About 80% of the total potential energy of coal is extracted, which is relatively high. However, despite the many benefits of coal, there are also many disadvantages. Coal is a fossil fuel that produces energy when burned. The burning of fossil fuels results in the release of hazardous gases into the environment and atmosphere... middle of paper ...... time. When coal runs out, we will be left with irreversible damage to the Earth and the level of global warming will be dangerously high. It takes millions of years for coal to regenerate because it cannot be made synthetically but must be formed naturally from fossils of many different things. Geothermal energy has infinite potential. It is capable of providing energy to the whole world. This natural resource is replenished relatively quickly. This source also has the ability to reduce global warming. There will be no real effect on the source we get this energy from if we all use it. Geothermal energy regenerates relatively instantly as water in reservoirs fills with rainwater and heat is continuously produced by the Earth. The Earth will never run out of geothermal energy, no matter how many people use it or how much they consume..