Global Warming  Catalyst  In which step of the carbon cycle do plants remove CO 2 from the atmosphere?  Which step of the carbon cycle is caused by humans only? What happens in it?  What are some negative effects of global warming? (You haven’t learned this yet, but think!)

Objectives By the end of today, all SWBAT…  Explain how humans cause global warming  Describe the effects of global warming on human welfare

Agenda  Catalyst Discussion  The Greenhouse Effect  Who cares about a few degrees?  Effects of global warming  Begin our storybooks  Closing  Exit Question

The State of our Environment 11 out of the last 12 years rank among the 15 warmest years in history Our Carbon emissions have increased by 20% since 1990 So what!?

The Greenhouse Effect  Key Point #1: Greenhouse gases trap heat in the Earth’s atmosphere  CO 2 = the most important greenhouse gas  The good: greenhouse gases are the reason that there is life on Earth! Without greenhouse gases, Earth would be -18°C

The Greenhouse Effect

Carbon Dioxide (CO 2 )  Most important greenhouse gas  Remember respiration and photosynthesis!?  R: plants and animals breathe in O 2, breathe out CO 2  P: plants breathe in CO 2, breathe out O 2

 Humans have caused an enormous increase in CO 2 concentration since industrial times

Global Warming  Global warming = the increase in global average temperature over time.

Human Causes of Global warming  Key Point #2: Humans cause global warming by increasing the amount of CO 2 in the atmosphere  Burning fossil fuels Gasoline Coal  Factory production Plastics  Deforestation Fewer trees to breathe in CO 2  Overpopulation Mo’ people, mo’ problems!

What this looks like:  Projected temperature rise of 2-5 °C by 2100  Asia and Africa most affected

Effects of Global Warming  Key Point #3: If we do not do something to stop global warming, its effects will be CATASTROPHIC CATASTROPHIC!!!

Rising Sea Level  Because glaciers are melting

Climate Refugees

Extreme Weather Events

Tropical Diseases

Desertification  10-20% less food produced in developing countries  Much of United States farmland will become desert  Massive food shortages

Global Warming Storybook  Inconvenient Truth Exemplar  End product: Produce a comic book explaining…  What the greenhouse effect is  Why the greenhouse effect helps us  Two ways humans cause global warming  Two bad things that will occur if we do not slow down global warming quickly

GP/IP  Rough draft: create a storyboard  Sketches of each page  Outline of the plot  Must get Mr. LY to sign off on the rough draft before you make the final  Final draft:  Will add more panels tomorrow, so DO NOT FORGET AT HOME!!!

Closing  The Earth is kept warm by greenhouse gases  Trap heat in the Earth’s atmosphere  CO 2  Humans are further warming the Earth by increasing the amount of CO 2 in the atmosphere  If we do not do something to stop global warming, its effects will be CATASTROPHIC  Can you name some examples?

Exit Questions  What is global warming, and why does it occur? (Hint: use the words “greenhouse gasses” and “traps”)  What are TWO ways that humans cause global warming?  Describe TWO bad things that will occur if we do not combat global warming now.

Extra Credit Read and write a summary of one (or more) of the 5 extra credit readings.