Download
1 / 24
240 likes | 252 Vues
16.2 Air Quality. Pollutants accumulate in the air. Smog sunlight interacts with pollutants produced by fossil fuels Harmful to human health. 16.2 Air Quality. Acid rain pollutants in the water cycle cause rain pH to drop can lower the pH of a lake or stream can harm trees.
E N D
16.2 Air Quality Pollutants accumulate in the air. • Smog • sunlight interacts with pollutants produced by fossil fuels • Harmful to human health.
16.2 Air Quality • Acid rain • pollutants in the water cycle cause rain pH to drop • can lower the pH of a lake or stream • can harm trees
16.2 Air Quality Thinning Ozone Layer O3 • Naturally occurring • Screens out most ultraviolet radiation from the sun • Unstable reactive gas • Pollutant in the lower atmosphere • Responsible for odor during lightning storms Hole in ozone layer over Antarctica 1% of UV radiation gets through • Responsible for all sun-burns and half-million skin cancer cases each year
16.2 Air Quality Greenhouse Effect CO2 & water vapor reflect heat back towards the earth Insulates Earth from the deep freeze of space Fossil fuels are burned = give off CO2 • Increased by 25% in the last 100 years Increases avg. global T
16.2 Air Quality • Rise in sea levels (melting glaciers) • Natural cycle of the earth North Pole
16.4 Threats to Biodiversity Preserving biodiversity is important to the future of the biosphere.
16.4 Threats to Biodiversity Loss of habitat = eliminates species. • Habitat fragmentation • occurs when a barrier forms within the habitat • often caused by human development
16.4 Threats to Biodiversity • allow species to move between different areas of habitat • Habitat corridors = solution
16.4 Threats to Biodiversity Introduced species is one that is brought to an ecosystem by humans. • accidental • purposeful • Can have anenvironmentaland economicimpact.
16.4 Threats to Biodiversity • Burmese python (Florida Everglades) • Invasive species often push out native species.
KEY CONCEPT As the human population grows, the demand for Earth’s resources increases.
Exploding Human Population Increasing population requires increasing amounts of • Food • Space for waste • E 20% of world’s population live in developed countries 80% live in developing countries • Populations are growing much faster
Technology has helped to increase Earth’s carrying capacity. • farm equipment • medical advancements
Nonrenewable resources are used faster than they form. • Coal • oil
wind • water • sunlight • Renewable resources • Resources must be properly managed.
16.5 Conservation Sustainable development meets needs without hurting future generations.
16.5 Conservation Conservation practices focus on a few species but benefit entire ecosystems. • The Endangered Species Act works to protect individual species from extinction. • A listed species is often called an umbrella species. • the habitat in which the species lives must be protected • other species are protected because they share the ecosystem
16.5 Conservation The Environmental Protection Agency (EPA) was created in 1970. • develops policies and regulations to protect the environment. • Clean Air Act • Clean Water Act • Endangered Species Act
16.5 Conservation • The National Park Service helps manage public lands. • The park system includes over 390 areas, covering 84 million acres.
16.5 Conservation • There are several ways that people can help protect the environment. • control population growth • develop sustainable technology and practices • protect and maintain ecosystems
