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Ambient levels do not have any direct health effects, it is an important 'greenhouse gas' which contributes to global warming. Its major man-made sources are road transport, power stations, other industrial combustion processes and domestic heating.

As carbon dioxide emissions lead to global environmental problems, efforts to reduce levels have to be co-ordinated across the world. The UK government, along with many other countries, has agreed a commitment to progressively reduce emissions in future years.