Governments must invest more in building safe drinking water systems, both to ensure greater access to this resource and to mitigate the effects of climate change, according to a report published on Monday by the World Health Organization (WHO), UN children’s agency, UNICEF, and the World Bank.

Providing water and sanitation for everyone on the planet is one of the Sustainable Development Goals (SDGs), agreed by all 193 UN Member States in 2015.

The report revealed that although more than two billion people gained access to safe drinking water over the past two decades, a quarter of the world’s population is still being left behind.