sentence: Fossil fuels produce a lot of pollution when burned.
sentences_after: This pollution is responsible for causing the earth to get warmer, called global warming. They are also non-renewable resources, there is only a limited amount of coal, gas, and oil, and it is not possible to make more. Eventually all the fossil fuels will be used. Scientists think that coal will have run out by 2230 and oil by 2030. Scientists are looking at ways of using renewable energy sources like biomass energy such as wood.
concept_name: fossil fuel
headings: Fossil fuel Problems
categories: Geology Fuel