|Carbon dioxide||Burning fossil fuels|
The concentration of carbon dioxide in the atmosphere has increased in the last 200 years.
The extra carbon dioxide is causing an enhanced greenhouse effect, greater than would happen naturally. There is a correlation between the increase in atmospheric carbon dioxide concentration and temperature change - as the concentration of carbon dioxide has increased, the global average temperature has generally increased too.
Suggest two reasons why climate change leads to rising sea levels.
Water from melting glaciers and polar ice enters the oceans. As the Earth's temperature increases, seawater warms up and expands.
There are international treaties aimed at reducing the emissions of carbon dioxide and other greenhouse gases. However, even if these emissions fell significantly, it would take a long time for the Earth's temperature to stabilise and then decrease. In the meantime, there are ways to mitigate the effects of climate change. These include:
These steps are expensive, need to be on a large scale, and may themselves harm the environment.