20 Global Climate Change
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1 20 Global Climate Change
2 Overview of Chapter 20 Introduction to Climate Change Causes of Global Climate Change Effects of Climate Change Melting Ice and Rising Sea Level Changes in Precipitation Patterns Effects on Organisms Effects on Human Health Effects on Agriculture Dealing with Global Climate Change
3 Reforestation in Ghana Question is how can we mitigate effects of climate change? Carbon Mitigation Initiative Most dangerous consequences at doubling of pre-industrial levels Certain steps in many areas can reduce effects Increase fuel economy Carbon capture and storage Many more
4 Introduction to Climate Change: Mean Annual Global Temperature warmest years (since ~1880) have occurred since 1990
5 Climate Change Terminology Greenhouse Gas Gas that absorbs infrared radiation Positive Feedback Change in some condition triggers a response that intensifies the changed condition Infrared Radiation Radiation that has a wavelength that is longer than that of visible light, but shorter than that of radio waves
6 Climate Change Terminology Greenhouse Effect Natural trapping of heat in the atmosphere; greenhouse gases absorbs energy and keeps it from leaving Radiative forcing Capacity of a gas to affect the balance of energy that enters and leaves Earth s atmosphere
7 Introduction to Climate Change Evidence for Climate Change 20 warmest years since mid-1800s have occurred since 1990 Phenological spring in N. hemisphere now begins 6 days earlier (date the buds of specific plants open) Sea level rise - <2cm/decade for most of 20 th century, now ~3cm/decade Warming is not due to natural causes Human produced greenhouse gases are most plausible explanation
8 Greenhouse Gases Greenhouse gas concentrations are increasing
9 Causes of Climate Change Increased concentration of CO 2 (right) Burning fossil fuels in cars, industry and homes Deforestation Burning of forests
10 Greenhouse Effect Enhanced greenhouse effect Build up of greenhouse gases (CO 2 and others) due to human activities
11 Pollutants That Cool the Atmosphere Atmospheric Aerosols Both human and natural sources Tiny particles (or sulfur) that remain in troposphere for weeks or months Sulfur-laden layer in the atmosphere reduces the amount of sunlight reaching earth Complicates models of climate change Aerosol effect Atmospheric cooling that occurs where and when aerosol pollution is the greatest
12 Climate Models Climate affected by: winds, clouds, ocean currents, and albedo Albedo measure of reflectivity (ice greater albedo than asphalt) Used to explore past climate events Advanced models can project future warming events Models are only as good as the data and law used to program them They have limitations
13 Climate Models
14 Climate Models Environmental feedbacks are complicated Positive or negative feedbacks More cloud production can result in a negative feedback Most models project climate a few decades or a century from now Based on different abatement strategies which will affect future CO 2 concentration
15 Unpredictable and extreme climate change We are projecting future climate with incomplete knowledge of environmental feedbacks Using solid scientific understanding, however environmental complexities abound Tipping points? A large rapid change occurs Examples Ocean conveyor belt affected by melting of freshwater in Arctic Polar vortex cold air from poles move toward equator
16 Effects of Global Climate Change Wildfire in California
17 Effects of Global Climate Change- Melting Ice and Rising Sea Levels IPCC projects sea-level rise of18-59cm by 2100 Sea level rise caused in 2 ways Thermal Expansion Melting of land ice Melting has positive feedback Increased melting decreases ice, which decreases albedo leading to further warming
18 Grinnell Glacier, Glacier National Park
19 Case-In-Point Impacts in Fragile Areas Eskimo Inuit live traditional life dictated by freezing climate Climate change is altering their existence Wildlife displaced Reduced snow cover and shorter river ice seasons Thawing of permafrost (right)
20 Effects of Global Climate Change- Changing Precipitation Patterns Some areas will get more water, some areas will have greater droughts
21 Effects of Global Climate Change- Effects on Organisms Zooplankton in parts of California Current have decreased by 80% since 1951 Affecting entire food chain Species have shifted their geographic range Migrating birds are returning to summer homes earlier Ecosystems at greatest risk of species loss (short term): coral reefs, mountain ecosystems, coastal wetlands, tundra, and polar areas
22 Effects on Organisms - Coral Reefs Coral reefs can be bleached (right) due to increase in water temperature Affects coral symbiontes and makes them more susceptible to diseases
23 Effect on Organisms - Vegetation
24 Effects on Human Health
25 Effects on Agriculture Difficult to anticipate Productivity will increase in some areas and decrease in others Rise in sea level will inundate flood plains and river valleys (lush farmland) Increase in drought frequency Effect on pests is unknown Warmer temperatures will decrease soil moisture - requiring more irrigation Location (i.e., elevation and altitude) where certain crops can be grown will change
26 International Implications of Climate Change Developed vs. Developing countries Differing selfinterests Differing ability to meet the challenges of climate change
27 Dealing with Global Climate Change Two ways to manage climate change Mitigation: Limiting greenhouse gas emissions to moderate global climate change Adaptation: Learning to live with environmental changes and societal consequences brought about by global climate change
28 Relationship Between Mitigation and Adaptation
29 Dealing with Global Climate Change - Mitigation Locate/invent alternative fuels to fossil fuels Increase efficiency of cars and trucks Carbon Capture and Storage Plant and maintain trees to naturally sequester carbon Geoengineering Global scale projects to mitigate effects Example: seeding ocean with iron to stimulate phytoplankton growth and CO 2 storage in deep ocean
30 Dealing with Global Climate Change - Adaptation Rising sea levels and coastal populations Move inland Construct dikes and levees Adapt to shifting agricultural zones NYC sewer line Climate change refugees People having to leave homes because of climate change effects Example: rising sea levels, storm surges
31 International Efforts to Reduce Greenhouse Gas Emission Kyoto Protocol Legally binding Provides operational rules on reducing greenhouse gases By 2014, 192 countries had ratified it US has not sign it - it will be difficult to implement without US backing EPA is taking it upon itself to define laws associated with CO 2 reduction in U.S. Obama administration meetings with other nations
20 Global Climate Change
20 Global Climate Change Overview of Chapter 20 Introduction to Climate Change Causes of Global Climate Change Effects of Climate Change Melting Ice and Rising Sea Level Changes in Precipitation Patterns
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