Renewable energy is energy generated from a natural resource. The reason these sources are called “renewable” is because they regenerate quickly and therefore we have a relatively eternal supply. Resources that cannot be replenished in a short period of time are classified as non-renewable. To acquire a sustainable future we should not so easily dispose of resources that cannot be renewed so quickly. On top of this is the fact that the use of chemicals as an energy source is having a negative impact 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 the environment. A well-known non-renewable energy source is coal. Coal is the most used energy generator in the world. Coal is a natural resource that comes from underground. Coal supplies are concentrated in industrial 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, which means high energy production at a relatively low unit cost. Coal supplies are expected to last longer than both oil and natural gas. Coal is the cheapest form of electricity production, making it a viable option for developing countries. About 80% of coal's total potential energy is extracted, which is relatively high. However, despite the amount of advantages that coal has to support it, there are also many disadvantages. Coal is a fossil fuel that produces energy when burned. The burning of fossil fuels causes the release of dangerous 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 global warming levels will be dangerously high. It takes millions of years for coal to regenerate as it cannot be produced synthetically but must form naturally from fossils of many different things. Geothermal energy has infinite potential. It is capable of providing energy to the entire world. This natural resource regenerates relatively quickly. This source also has the ability to reduce global warming. There will be no real effect on the source from which we get this energy if we all use it. Geothermal energy regenerates relatively instantaneously as the water in the reservoirs fills with rainwater and heat is continuously produced by the Earth. The Earth could never run out of geothermal energy, no matter how many people use it or how much they use.