Reading, United Kingdom — Greenhouse gases are produced as a by-product of the use of fossil fuels to supply light and heat, produce food, manufacture products and transport people and goods. These gases congregate in the upper atmosphere and result in global warming through absorption of sunlight reflected from the earth's surface. At the 21st meeting of the Parties to the UN Framework Convention on Climate Change in Paris, it was agreed to limit the average increase in global temperature to 2°C [1].
Energy efficiency
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