Why are water conservation and pollution control important for future generations?

a
Waste and pollution will lead to less rainfall over land.
b
Pollution and waste will lead to a shortage of clean water for human use.
c
Pollution will cause an increase in tourism in beach communities.
d
Waste will lead to less water in the oceans, rivers, and lakes.

b. Pollution and waste will lead to a shortage of clean water for human use.