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Global Warming

Physical causes of global warming and cooling include:
Variations in solar energy - sunspot activity raises global temperature.
Volcanic eruptions - large quantities of volcanic dust in the atmosphere shield the earth
from incoming insolation, lowering global temperature. For example, the eruption of
Mount Pinatubo in 1991 caused…

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Disadvantages of Global Warming
Ocean circulation disrupted, disrupting and having unknown effects on world climate.
Higher sea level
leading to
flooding of low-lying lands and deaths and disease from flood
and evacuation.
Deserts get drier leaving to increased desertification
Changes to agricultural
production that can lead to
food shortages…

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and destruction of forests. There is debate as to whether global warming exists, as it could merely
be another example of changes in temperature the world has seen over millions of years.
Major sources of greenhouse gases:

Way it increases
Gas: Source: Use:
global warming:
Water vapour and
clouds are…

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Many greenhouses gases exist naturally, and it is human actions that are increasing their
concentrations within the lower atmosphere. It is believed that as the amount of greenhouse
gases in the atmosphere increases, the amount of long-wave infra-red radiation in the lower
atmosphere also increases, thus raising temperatures.
Positive and…


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