________ often contain infectious agents that cause waterborne diseases such as.
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Americans
________ produce garbage and other municipal waste at a rate of about 2 kilograms per person per day.
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Air pollution
________ is the cause of the destruction of the Earths ozone layer.
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Nitrous oxide
________ emissions are a byproduct of increased fertilizer use.
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concentrations
Human activities have increased the ___________ of three greenhouse gases.
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Humans
________ have significantly altered the chemical composition of the atmosphere.
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Spatial interaction
________ among regions did not halt the creation of distinctive regional subsystems of culture.
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Water
________ plays a critical role in moderating the Earths climate.
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Pollutants
________ come primarily from burning fossil fuels.
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Ozone problems
________ lead to greater exposure to UV radiation and it increases the incidence of skin cancer and, by suppressing bodily defense mechanisms, increases risk from a variety of infectious diseases.
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development of agriculture
Forest clearing accompanied the ________ and spread of people throughout.
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natural greenhouse
Intensifying the ________ effect which leads to global climate change.
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Solid wastes
________ are generally landfills or incineration.
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Human impact
________ on the environment has shifted scales from the local or regional to the continental and global scales.
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hazardous chemical or radioactive wastes
10 percent of industrial waste materials are ________.
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Humans
________ are negatively affecting the arid and semiarid regions of the world.
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Air pollution
________ is a global problem today.
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Humans
________ have transformed the Earths landscapes since the end of the last glaciation.
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