Greenhouse gases such as carbon dioxide and methane occur naturally in the atmosphere. In fact, they are necessary for life on Earth. They absorb sunlight reflected from Earth, preventing it from escaping into space. By trapping heat in the atmosphere, they keep Earth warm enough for people to live.

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Therse are too many harmful gases which pollute our environment. Some of them are sulphur dioxide, nitrogen dioxide, carbon monooxide and increased concentration of CO2 can also be harmful.

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sulphur dioxide, nitrogen dioxide, carbon monooxide and increased concentration of CO2 can also be harmful.

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sulphur dioxide, nitrogen dioxide, carbon monooxide and increased concentration of CO2

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Therse are too many harmful gases which pollute our environment. Some of them are sulphur dioxide, nitrogen dioxide, carbon monooxide and increased concentration of CO2 can also be harmful.

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