1. What three main factors are causing a water shortage ?
2. How much of the world's total water supply is usable fresh water
3. What happened to world population and water use in the 20th century?
4. How does climate change affect water supply?
5. Summarize what might happen to world population and water supply in the next 50 years.

Answers :
1. -Climate change. -Pollution. -Human demand.
2. It is 2.5 percent.
3. It tripled to six billion in the 20th century.
4. The global warming may not reduce the to dramatically shift weather like droughts.
5. I think the fresh water level will increase.

ill miss science class :], only had it for half thee yearr.
midtermss nextt week too! good luck to those who have to write.. like me :]
today is the last day and i hope everyone had fun with thiss class :D
mrs rosso is honestly my favorite teacher too :]
see youu!