KEY CONCEPT Fossil fuel emissions affect the biosphere.

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KEY CONCEPT pg. 488 Fossil fuel emissions affect the biosphere.

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Presentation transcript:

KEY CONCEPT Fossil fuel emissions affect the biosphere.

Pollutants accumulate in the air. Pollution is any undesirable factor added to the air, water, or soil. Smog is one type of air pollution. sunlight interacts with pollutants in the air pollutants produced by fossil fuel emissions made of particulates and ground-level ozone

Smog can be harmful to human health. Acid rain is caused by fossil fuel emissions. produced when pollutants in the water cycle cause rain pH to drop can lower the pH of a lake or stream can harm trees

Air pollution is changing Earth’s biosphere. The levels of atmospheric carbon dioxide rise and fall over time. High levels of carbon dioxide are typical of Earth’s warmer periods.

sunlight penetrates Earth’s atmosphere The greenhouse effect slows the release of energy from Earth’s atmosphere. sunlight penetrates Earth’s atmosphere energy is absorbed and reradiated as heat greenhouse gases absorb longer wavelengths Greenhouse gas molecules rerelease infrared radiation methane (CH4) water (H2O) carbon dioxide (CO2)

Global warming refers to the trend of increasing global temperatures. North Pole