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People use energy for transformation, heating, cooling, cooking, lighting, and industrial production.
Many developed countries use firewood and animal waste as important energy sources.
Coal, oil and gas account for more than 90% of the world energy supply but they are limited and cause air pollution.
Factories began to use coal in the beginning of the Industrial Revolution of the 19th century.
Extensive environmental damage hasn’t been caused by mining or drilling for fossil fuels.