Scientists warn of human impact on world's water

Human activity is altering the world's water system to a degree it has not experienced in more than 11,000 years, an international group of scientists says.

"We have altered the Earth's climate and its chemistry, the snow cover, the permafrost, the extent of ice in the sea and glaciers, and the volume of the oceans. All of those are fundamental elements in the hydrological cycle," Anik Bhaduri, executive officer of the International Project Office of the Global Water System Project, told Efe.