Temperate forests have also disappeared which makes the land more dry and promotes evaporation. Often the native species are the most efficient at producing meat without damaging the environment. Water Crisis Water is essential for a society. Desalinating the sea is very costly and only worthwhile for human consumption in very wealthy areas. It is too expensive to use for agriculture.
Water is stored in the ground - the water table .
If it is pumped out of the ground faster than it is replenished by rain, someday it will run out. Water can be polluted so badly that it is unfit for human consumption or even too salty for agricultural use. As water becomes more rare, its price will increase and its value can cause international tensions. In the US, we are blessed with lots of coal and uranium, some oil, lots of natural gas, lots of rivers, some geothermal, wind. Coal - Readily available.