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Humans & the Environment

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Presentation on theme: "Humans & the Environment"— Presentation transcript:

1 Humans & the Environment

2 (22-1) Interconnected Planet
Earth’s layers Atmosphere: gases Ozone layer Climate Greenhouse effect Hydrosphere: water Geosphere: rock Biosphere: part of Earth where life exists

3 Biodiversity Variety of life forms in an area Species diversity
Richness: # of species in an area Evenness: # of indiv.’s of each species in an area Genetic diversity: amt. of variation in the genetic material of all members of a pop.

4 (22-2) Environmental Issues
Air Pollution Smog: water vapor mixed w/ human-made chemicals CFC’s & ozone thinning Global warming Acid precipitation: air pollutants combined w/ water Land & Water Pollution Biological magnification: chemicals become more concentrated in organisms higher on the food chain

5 Ecosystem Disruption Extinction: death of every member of a species
Endangered Ecosystem Imbalances Keystone species: affects many other species in a community Ex: sea otter

6 Human Resource Use Primary production: total E stored through photosynthesis by terrestrial organisms Ecological footprint: human impact on ecosystems Sustainability: ability to meet human needs so the pop. can survive indefinitely

7 (22-3) Environmental Solutions
Conservation Biology: i.d., protect, & manage natural areas w/ large biodiversity Biodiversity hotspots Bioindicator: species sensitive to ecological change Restoration Biology: plan ways to reverse changes & replace missing ecosystem components

8 Laws & Efforts Debt-for-nature swap: richer countries/org. pay debts if developing country takes preventative steps Ecotourism: supports cons. of ecologically unique areas while bringing economic benefit to locals Urban ecology: study of biodiversity in areas densely populated by humans

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