2. What is global warming? Global warming or climate change is the gradual increase of the average temperature of the Earth The average temperature of the Earth's surface is around 59˚F or 13 ˚C. Greenhouse Gases in the atmosphere hold in heat Without these gases, the Earth’s surface temperature would drop to around 0 ˚F.

3. The Atmosphere The Earth is surrounded by a thin layer of gases Oxygen Carbon Dioxide Nitrous Oxide Methane Greenhouse gases

4. Atmosphere Supplies gases required for life Oxygen Carbon dioxide Offers protection from the sun’s ultraviolet radiation Helps control Earth’s temperature by trapping solar energy next to the surface

6. Carbon Dioxide- CO 2 Accounts for 80% of greenhouse gases emissions –Enters atmosphere by 1.Carbon cycle 2.Burning fossil fuels 3.Deforestation 4.Cement production

7. Methane-CH 4 A gas that is emitted from the following sources: –Volcanic activity –Natural gas fields –Solid waste landfills –Byproduct of biomass –One of the ingredients found in a burp! Read this article: Cows that burp less aid climate fight!

8. Nitrous Oxide- N 2 O A gas that is emitted from the following sources: –Burning fossil fuels –Use of fertilizers –Burning biomass –Can be used as a mild anesthetic for minor surgeries (Also known as laughing gas!!)

9. Some of The Effects Water levels will rise in oceans The timing of the seasons will change Increased spread of disease Stronger hurricanes and storms Animals change behavior More plants and animals will go extinct Allergies and respiratory ailments will get worse

10. Some Evidence Before and after of disappearing glaciers