Critical Global Environmental Issues
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Transcript of Critical Global Environmental Issues
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Critical Global Environmental IssuesDr. Jessica Braswell, Assistant Professor of Environmental Science
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Global Environmental Issues
• Industrialized agriculture• Water depletion• Water pollution• Air pollution• Climate change• Biodiversity loss• Invasive species• Human population
growth
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Agriculture• Industrialized agriculture:
“high-input” farming– Water– Fertilizer– Pesticides
• Agricultural practices influenced by– Climate– Economics– Local, national,
international politics
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Environmental Impacts of Agriculture
Loss of soil fertility Air and water pollution due to
fertilizers and pesticides
Water depletion
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Environmental Impacts of Agriculture
Reliance on fossil fuels
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Water Depletion
• Water Use– Irrigation• Agriculture• Landscaping
– Drinking– Washing,
bathing, flushing toilets
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Water Depletion
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Water Depletion
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Luke Robinson (flickr)Peakwater.org
Impacts of Water Depletion
Reduced water supplies for drinking and irrigation
Surface water, and the livelihoods it supports,
diminished
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Svsu.edu
Water Pollution
• Nutrients from fertilizers and animal wastes
• Pathogens• Sediment• Debris• Toxic chemicals
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Water Pollution
• Pollution does not respect international borders
• Tragedy of the commons
Bordersewagecoatlition.org
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Impacts of Water Pollution
Aquatic habitats no longer support life
Water becomes unsafe for drinking and irrigation, health problems arise
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Air Pollution
• Particulates, toxins, smog• Mainly results from the combustions of fossil
fuels, mining, agriculture
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Maltaweather.info
Impacts of Air Pollution
Acid rain
Health problems
Global climate change
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Carlyle Calvin
Climate Change
• Increasing concentrations of carbon dioxide and other greenhouse gases
• Mainly from the combustion of fossil fuels, deforestation, and agriculture
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Impacts of Climate Change
The Telegraph, UK
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Biodiversity Loss
• Loss of species, purposeful or accidental
• Protection and enforcement highly variable among nations
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Impacts of Biodiversity Loss
Loss of potential medicines and food resources
Loss of ecotourism
Ecosystems compromised
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Invasive Species
• Purposeful or accidental introduction
• Outcompete or eat native species
• Introductions increase along with global movement of people and goods
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Impacts of Invasive Species
Native species decline
Vpr.net
Biological and structural
habitat changes
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Human Population Growth
Population growth rates
Less than –2%–2–0%0–1.44%1.44–2.5%2.5–3.5%More than 3.5%
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Impacts of Human Population Growth
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