Greenhouse Gases
There is relatively little controversy about the function of CO2 as a greenhouse gas
Without greenhouse gases, the world would be too cold to support life
The greenhouse effect is not enough by itself to support claims of ‘dangerous’ global warming
Greenhouse gases are gases whose properties are said to be ‘heat-trapping’ — they absorb infrared energy and re-emit it, scattering it and thereby keeping it in the atmosphere rather than allowing its passage out to space. This heat-trapping phenomenon can be demonstrated in a laboratory, and is the most basic scientific premise of the climate change debate. However, what happens in a laboratory cannot always be applied to our understanding of what happens in the real world, where other factors combine to make things more complicated.
It is important to understand that the greenhouse effect is natural and required for life on Earth, but which is a process that has, according to advocates of far-reaching green policies, been adversely altered by industrial emissions. Without natural greenhouse gasses, the world would be about 33°C colder than it is today. Most of the heat from the Sun would be lost to space. The most dominant greenhouse gas in the atmosphere producing this warming effect is water vapour, which accounts for at least half of the total contribution of all greenhouse gases to the greenhouse effect, with additional significant warming coming from clouds. Nitrous oxide, methane and ozone are other key global warming gases, but excess carbon dioxide (CO2) is the major greenhouse gas of concern. The problem is therefore a matter of degree: how much has the atmosphere been altered by anthropogenic greenhouse gases.
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