Climate Change
Climate Change
Climate Change
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Example of a Positive Feedback<br />
1. Temperature goes up due to GHGs.<br />
2. This means more sea ice and glaciers melt.<br />
3. Ice is very reflective.<br />
4. Therefore, less sunlight is reflected.<br />
5. Therefore more sunlight is absorbed, causing a further<br />
incrase in temperature!<br />
6. Positive feedback – the initial increase in temperature<br />
in (1) leads to events that cause an amplification of this<br />
temperature increase)<br />
• e.g. GHGs cause an increase in T by 2 K, but the<br />
melting ice scenario causes a further warming by 2 K,<br />
leading to an overall warming of 4 K.<br />
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