Question

What was the impact of the change in environment around 12,000 years ago

Answer 1

The Clean Water Act regulates pollutant discharges into U.S. waters, and affects some agricultural operations, such as large concentrated animal feeding operations (CAFOs) and, in some circumstances, farms that dredge or fill wetlands.


Background:  The predecessor statute to the Clean Water Act (CWA) dates to 1948, but the law in its current form represents a complete re-write in the light of growing environmental concerns in the 1960s and 1970s.  The current law, written in 1972 and amended several times since, was a major expansion of the federal role in regulating water pollution, which had previously been seen as a state or local issue.   The CWA seeks to move the nation to clean, abundant water supplies, and its provisions support protection of fish and other organisms in U.S. waters. Among the requirements of the CWA was that municipal and industrial wastewater be treated before being discharged into the nation’s waterways

Answer 2

Answer:

Major changes in the climate of the world with a shift to relatively warmer conditions were noticed around 12,000 years ago. As a result, grasslands developed in many regions. This resulted in an increase in herbivorous animals like deer, antelope, goat, sheep and cattle. This encouraged people to herd and rear these animals. They also engaged in fishing.

Several grain bearing grasses such as wheat, barley and rice also grew around this time in different parts of the sub-continent. Men, women and children began to collect these grains for usage as food. By the time, they also learnt where these grains grew and when they ripened.