Three ways that humans affect earths systems

1. they smoke that cause the green house effect 
2.the gasoline from cars goes into the air that you breath and the gas has cause pollution 

3.by littering.The garbage that you liter with goes into the sewer which leads to the sea and can effect the sea animals and the sea food eaters 

The answer to this question is  c. pharmaceutical accumulation  reclaimed water refers to the water that being used again after it already  used for agricultural purposes.this type of water often contains pharmaceutical accumulation because of the chemical fertilizer that is used for the plants is absorbed into the water.

Developed countries will see a decrease in natural resources, because their population will decrease.