An increased greenhouse effect and the depletion of the ozone layer are two examples of
OA. processes that have positive effects on all organisms on Earth.
OB.
processes triggered by human activities that have impacted the natural balance of the Earth's atmosphere.
c.
naturally occurring processes that have caused changes in the atmosphere during the past century.
OD. processes that have no effect on the atmosphere.

For the strategies below, decide whether they are best described as demand-side solutions or supply-side solutions to meeting human needs for fresh water. remember that a demand-side solution reduces demand for fresh water, whereas a supply-side solution increases the supply of fresh water. (a) damming a river to create a reservoir (b) desalinating seawater (c) a nation invading a neighboring country to access their rivers (d) raising water prices for consumers and businesses (e) providing tax breaks for companies that use less water (f) replacing inefficient irrigation with more-efficient drip irrigation to grow crops (g) requiring low-flow showerheads in all new homes