Chapter 13 Human Impacts of the Environment

Human wastes

________ often contain infectious agents that cause waterborne diseases such as.

Americans

________ produce garbage and other municipal waste at a rate of about 2 kilograms per person per day.

Air pollution

________ is the cause of the destruction of the Earths ozone layer.

Nitrous oxide

________ emissions are a byproduct of increased fertilizer use.

concentrations

Human activities have increased the ___________ of three greenhouse gases.

Humans

________ have significantly altered the chemical composition of the atmosphere.

Spatial interaction

________ among regions did not halt the creation of distinctive regional subsystems of culture.

Water

________ plays a critical role in moderating the Earths climate.

Pollutants

________ come primarily from burning fossil fuels.

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.

development of agriculture

Forest clearing accompanied the ________ and spread of people throughout.

natural greenhouse

Intensifying the ________ effect which leads to global climate change.

Solid wastes

________ are generally landfills or incineration.

Human impact

________ on the environment has shifted scales from the local or regional to the continental and global scales.

hazardous chemical or radioactive wastes

10 percent of industrial waste materials are ________.

Humans

________ are negatively affecting the arid and semiarid regions of the world.

Air pollution

________ is a global problem today.

Humans

________ have transformed the Earths landscapes since the end of the last glaciation.