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 can harm us if particulates are inhaled

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)

What is greenhouse gas and the green house effect?

The Greenhouse Effect G.H.E. is naturally good (it warms Earth) Problem: Excess CO2 absorbs excess heat near the earth Fear: Climate patterns change, ice caps melt Main Cause: CO2 from burning of fossil fuels (coal, oil, natural gas) Solutions: Reduce use of fossil fuels, regrow trees, alternative energy sources

What’s in a name? The purpose of a greenhouse is to trap heat year round

Earth

Earth

Earth

The Greenhouse Effect

The Greenhouse Effect in our solar system Venus: The Extreme Greenhouse Effect Mars: No Greenhouse Effect Earth: Balanced Greenhouse Effect Little heat is trapped by the thin CO2 atmosphere. Temperatures can be around 20 F. Heat is trapped by the thick CO2 atmosphere. Temperatures reach 750 F. Average global temperature is 57 F.

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