Threats to environment lecture

Threats to environment lecture - Deforestation Although the...

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Deforestation Although the precise area is debated, at least 80,000 acres of forest disappear from Earth each day. At least another 80,000 acres of forest are degraded each day. Mongabay.com
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Deforestation As these forests fall, species are threatened or extinguished, more carbon is added to the atmosphere, climactic conditions are further altered, and more topsoil is lost to erosion. Industrial logging, conversion for agriculture (commercial and subsistence), and forest fires— often purposely set by people—are responsible for the bulk of global deforestation today.
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Destruction of Natural Ecosystems It isn’t just forests that are destroyed: Wetlands, prairies, deserts, arctic tundra, river basins, oak savannahs, … We destroy whatever is in our path if we want the natural resources or if we want to develop an area for farming, for roads, for energy production, or for commercial, industrial, or residential development
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Degradation of Farmland Farmland fertility is destroyed because common farming practices result in Wind and water erosion, eliminating precious topsoil Salinization of the soil because of irrigation Depletion of water in aquifers, rivers, creeks, lakes Pollution of soil and water from chemical fertilizers, herbicides, pesticides
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Solid Waste U.S. is largest producer of solid waste in industrialized nations, absolute and per capita The average American produces 4.6 pounds of trash per day… land-filled, dumped in oceans, incincerated, recycled On average, less than 1/4 of an American’s waste is recycled
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Chemical pollution More than 75,000 chemicals released into environment by humans For example, more than 20,000 pesticide products are used in U.S. Farm workers use about 1.2 billion pounds of pesticides annually (+ have disproportionate amount of cancer) Automobiles and industry emit chemicals that end up in the air, soil, water
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Hazardous Waste The U.S. Resource Conservation and Recovery Act describes "hazardous waste" as waste that can: cause, or significantly contribute to an increase in mortality (death) or an increase in serious irreversible, or incapacitating reversible illness; or pose a substantial (present or potential) hazard to human health or the environment when improperly treated, stored, transported,
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Threats to environment lecture - Deforestation Although the...

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