The volume of water in the world's largest lakes is decreasing 

Since the early 1990s, the volume of water in most of the world's major lakes and reservoirs has declined, mainly due to climate change, raising concerns about the availability of water for agriculture, hydropower and human consumption, according to a new study conducted by an international group of scientists.

Fanfan Yao, a surface water hydrologist at the University of Virginia who led the study published in the journal Science, said the 56% decline in natural lakes is due to climate warming and human consumption.