What is scientists' attitude towards the future of Chad Lake

A．The related programs on the computer were out of date.
B．More and more people drew water directly from the lake for drink.
C．A heavy rain happened around 1980.
D．The irrigation from the source water increases.

A．Chad Lake located in the middle of Chad in northern Africa.
B．The water from Chad water can now only be used for irrigation.
C．The area around Chad Lake has suffered from heavy rain lack many decades.
D．Population around the Chad Lake now begins to decrease due to water lack.