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They discovered a new type of renewable energy source: geothermal energy. This form of energy is produced by using the heat of the Earth’s core to generate electricity. It is a clean and renewable energy source that can help reduce carbon emissions and reliance on finite fossil fuels. Additionally, geothermal energy can provide cost-effective and reliable energy for households and businesses. It has the potential to revolutionize how we all use energy and help us to move towards a more sustainable future.