The Environment & Human Impact. Humans and the Environment 10,000 years ago, there were only about 5...
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![Page 1: The Environment & Human Impact. Humans and the Environment 10,000 years ago, there were only about 5 million people on Earth. The development of dependable.](https://reader030.fdocuments.us/reader030/viewer/2022032805/56649efa5503460f94c0c2a4/html5/thumbnails/1.jpg)
The Environment & Human Impact
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Humans and the Environment
• 10,000 years ago, there were only about 5 million people on Earth.
• The development of dependable food supplies, sanitation, and medical care have allowed the population to grow to more than 6 billion, and it keeps rising!
• Learning about our planet can help us care for the environment and can help us ensure that it will continue to support us and other species on Earth
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Resources
• Earth’s resources are described as renewable or nonrenewable
• Renewable resources are natural resources that can be replaced at the same rate at which they are consumed– Ex: Wind energy & solar
energy
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Resources
• Nonrenewable resources are resources that form at a rate that is much slower than the rate at which they are consumed– Ex: Coal and Oil– These resources are
fossil fuels that are formed from the remains of organisms that lived millions of years ago
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The Environment and Health
• Our health and quality of life are affected by the state of the environment
• Pollution and habitat destruction destroy the resources we need to live, such as the air we breathe, the water we drink, and the food we eat
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Air Pollution
• Most air pollution is caused by human activities
• The burning of fossil fuels releases pollutants into the atmosphere (carbon dioxide, sulfur dioxide, and nitrogen oxides)
• Air pollution causes respiratory problems for people, results in acid rain, damages the ozone layer, and may affect global temperature
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Acid Rain
• Acid rain is precipitation that has an unusually high concentration of pollutants
• It can damage forests and lakes
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The Greenhouse Effect
• The greenhouse effect is the natural and necessary warming of the Earth that happens when greenhouse gases in the air (like CO2 and water vapor) absorb and reradiate heat
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Global Warming• The burning of fossil fuels has INCREASED the
amount of greenhouse gases in the atmosphere, which may be causing the Earth to become TOO warm
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MISUNDERSTANDING ALERT!
• Greenhouse effect vs. global warming!• What’s the difference?• How are they related?
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Water Pollution
• Water pollution can come from fertilizers, pesticides, industrial waste, oil runoff from roads, and landfills
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What can we do?