Artificial - The name used to describe something as 'man-made', Combustion - The process of burning something in order to produce heat energy, Greenhouse effect - The process where some of the heat is trapped inside the atmosphere instead of radiating back into space, Climate change - Another word for global warming, but has a broader definition., Respiration - Both plants and animals do this. It required oxygen and gives our carbon dioxide, Coal - A fossil fuel made from ancient trees, Oil - A liquid fossil fuel made from ancient sea creatures, Nuclear - A source of energy made by splitting the nucleus of atoms, Fossilisation - The process where dead animals are turned into fossils after being buried under sedimentary rocks, Natural - When something occurs in nature,

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