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However, there were several pollution enforcement cases in the 1960s and 1970s where the law was cited for broader pollution control objectives, prior to passage of the 1972 Clean Water Act. [ 13 ] By the mid-20th century, water pollution laws in the United States began to include health- and use-based standards to protect environmental and ...
Looking down from the Hollywood Hills, with Griffith Observatory on the hill in the foreground, air pollution is visible in downtown Los Angeles on a late afternoon.. Air pollution is the introduction of chemicals, particulate matter, or biological materials into the atmosphere that cause harm or discomfort to humans or other living organisms, or damage ecosystems.
Environmental education is not restricted to in-class lesson plans. Children can learn about the environment in many ways. Experiential lessons in the school yard, field trips to national parks, after-school green clubs, and school-wide sustainability projects help make the environment an easily accessible topic.
Contaminants can come from one of four main sources. These are sewage discharges, industrial activities, agricultural activities, and urban runoff including stormwater. [153] Water pollution may affect either surface water or groundwater. This form of pollution can lead to many problems. One is the degradation of aquatic ecosystems.
Pollution from the Exxon Valdez oil spill. As with many countries, pollution in the United States is a concern for environmental organizations, government agencies, and individuals. Billions of pounds of toxic chemicals are released into the air, land, and waterways in the U.S. each year.
Environmental degradation is the deterioration of the environment through depletion of resources such as quality of air, water and soil; the destruction of ecosystems; habitat destruction; the extinction of wildlife; and pollution. It is defined as any change or disturbance to the environment perceived to be deleterious or undesirable.
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