A future of increased water scarcity is foreseeable, the report warned, which will have negative effects on the global economy.

By the year 2050, 45 percent of global gross domestic product and 40 percent of global grain production will be threatened by environmental damage and lack of water resources, the report said.

Heavier burden on world's poor

The title of the UNESCO report referenced a key finding: the inequality of water access. People who are poor or marginalized are also more likely to have limited access to proper water and sanitation, the report noted.

The report's editor-in-chief, Rick Connor, said that in cities, rich homes with piped water tended to pay far less per liter of water, while poor people living in slums often had to buy water from trucks, kiosks and other vendors, spending roughly 10 to 20 times more.

"The misperception is that they don't have water because they can't afford it — and that is completely wrong", Connor told the Thomson Reuters Foundation.

Half of the world's population with inadequate access to safe drinking water lives in Africa. More strikingly, only 24 percent of the population in sub-Saharan Africa has access to safe drinking water.

Germany could do more

Ulla Burchardt, member of the Germany's SPD and part of UNESCO's Germany board, urged her country to do more, in light of the reports findings.

Although Germany is on the right track when it comes to water rights, "we are partly responsible for the great problems in other regions of the world, such as the import of cotton or beef, the production of which can be very water-intensive," Burchardt warned.

"Safe water and safe sanitation are human rights", Burchardt said. "But for billions of people, these rights not realized," she concluded.