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Global Warming
Catalyst In which step of the carbon cycle do plants remove CO2 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 Environment11 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 CO2 = 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
The Greenhouse Effect
Humans have caused an enormous increase in CO2 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 CO2 in the atmosphere Burning fossil fuels
Gasoline Coal
Factory production Plastics
Deforestation Fewer trees to breathe in CO2
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 CO2
Humans are further warming the Earth by increasing the amount of CO2 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.
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