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Human Population
Number of living people on Earth
Landfills
Areas where trash is buried in the ground
Incinerator
Areas where garbage is burned
Toxic wastes
Substances that can damage living things
Pollution
Anything in the environment harmful to living things
greenhouse effect
Trapping heat inside a greenhouse
Global warming
The increase in temperatures around the world
Ozone layer
Keeps most ultraviolet (UV) radiation from the sun from reaching earth
Chlorofluorocarbons (CFCs)
usage of this is believed to cause the ozone layer to thin
Acid rain
Made when fossil fuel chemicals combine with water vapor and return to earth
Groundwater
Water that collects in cracks below earth’s surface