jessiesanghera


 * TOPIC 5: Describe how climate can be influenced by human activities (eg. Greenhouse gasses, depletion of ozone layer) **



** "Global warming, along with the cutting and burning of forests and other critical habitats, is causing the loss of living species at a level comparable to the extinction event that wiped out the dinosaurs 65 million years ago. That event was believed to have been caused by a giant asteroid. This time it is not an asteroid colliding with the Earth and wreaking havoc: it is us." **   -Al Gore



Human activities can cause climate change, by having changes in earth’s atmosphere, with large amounts of greenhouse gases being produced. Another example that also causes climate change is how fossil fuels release carbon dioxide gas into the atmosphere.

** The Greenhouse Gasses: **

A greenhouse gas, (sometimes abbreviated GHG) is a gas in our atmosphere that s usually absorbs and emits radiation within thermal infrared range. The mainly greenhouse gasses in earths atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, ozone and chlorofluorocarbons.



** The Greenhouse effect: **

There are six kinds of greenhouse gasses: 1) water vapor 2) carbon dioxide 3) methane 4) nitrous oxide 5) ozone 6) chlorofluorocarbons



The greenhouse effect is the rise in a temperature that the earth experience when usually all these six gasses produce in the atmosphere, but carbon dioxide is mainly the most affecting gas because it’s being produced by human activities. But if we had no gasses the heat would escape back into space and earth temperature would be 60 **F** colder. The greenhouse effect is also important. If there was no greenhouse gas, the earth would not be warm enough for humans to live. But it the greenhouse gas gets more stronger and effective, it could make the earths temperature warmer then needed, even the earth getting a little warmer can cause problems to humans, plants and also animals.

** The ozone layer: **

The ozone layer is a layer in the stratosphere, that’s encircling the earth and has large amounts of ozone in it. The layer tend to shield the earth from the harmful ultraviolet radiation that comes from the sun. 




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