Four environment practices that may lead to harmful effects to the environment​

1. Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation.

2. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water.

3. These negative impacts can affect human behavior .

4. It prompt mass migrations or battles over clean water.

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john maynrd keynes developed new economic respose to the                           ( b. great depression if the 1930's)