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The Greenhouse Effect and Global Warming
The Greenhouse Effect
The greenhouse effect is a natural process that
occurs all the time and keeps average global
temperatures at around 17 c. Without it, the
average temperature at the surface of the Earth
would be about -18 c.

This effect is the…

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Global Warming
Global warming is the term for the increase in average global temperatures over the last century.

The Earth has always shown periodic fluctuations in temperature.
We cannot therefore say for certain that this recent temperature increase is due to human activities.
What we can say is that the…

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Measuring Carbon Dioxide
To determine whether there is a correlation between the concentration of carbon dioxide in the
atmosphere and global temperatures requires measurements of both these factors over many thousands
of years.

It is possible to determine the age of fossils by measuring the amount of radioactive decay of…

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