By Ruth Mathews, Executive Director, Water Footprint Network
Take one look at the news this month and it’s clear that water scarcity is causing misery to many. Lack of rainfall in southern Africa will have a "devastating" impact on the region's food security (UN FAO
), 49 million people could be affected (UN WFP
) and in Zimbabwe, where more than a quarter of the population are now in need of food aid, President Mugabe has declared a state of disaster
due to drought. A number of Caribbean countries
have been placed under immediate drought warnings or watches, the Marshall Islands
has declared a state of national emergency, citing its severe drought conditions as one of the worst disasters to ever befall the archipelago nation, and the central government of India
is giving monetary assistance to seven drought-affected states.
Last month’s top listing of water crises as the global risk of highest concern (WEF’s Global Risks Report 2016
) was followed this month with the stirring of political reaction as the Obama administration announced its plans to reduce the U.S. water footprint
by a third.
Four billion people.
That’s how many people live in areas with severe water scarcity at least one month a year, research just published in Science Advances
tells us. What’s more, in 37 countries, that’s the entire population and in 97 countries it’s over half of the population.
This startling view of the number of lives affected by water scarcity is made possible by research done by Prof. Arjen Hoekstra and Dr. Mesfin Mekonnen at the University of Twente, which provides a more detailed view of water scarcity – month by month and at a finer spatial resolution than ever before. This gives us a better understanding of how water scarcity changes over time and from one place to another. It also uses the water footprint, instead of water withdrawals to assess the impact on water resources of our water use – making it more representative.
Water scarcity can limit economic opportunities, degrade natural ecosystems, lead to loss of valuable ecosystems services and have negative impacts on subsistence uses, such as access to drinking water and loss of local fisheries.
In countries already facing water scarcity, opportunities for reducing the number of undernourished people may be limited because increasing food production may require greater reliance on irrigation to increase crop yields, putting even more pressure on limited water resources.
But, it is not just water used to feed local populations that is driving the move toward increasing levels of water scarcity, many severely water-stressed countries use huge amounts of water to produce products for export. In the ten largest net blue virtual water exporting countries, over half of the population experience severe water scarcity during at least one month per year.
India and Pakistan with 194.6 and 41.4 million undernourished people, respectively, are the top two net virtual blue water exporters. They also have 97% and 84%, respectively, of their population facing severe blue water scarcity at least one month of the year. Export and trade policies in these countries put pressure on the local water resources that goes beyond sustainable limits. This imposes a risk to the sustainability of future exports from these countries, in addition to reducing hunger, when considering constraints of water resources.
To “substantially reduce the number of people suffering from water scarcity” (SDG Goal 6) and to achieve greater food and water security (SDG Goal 2) we all need to work together to ensure that:
Water is used within sustainable limits such that ecosystem and subsistence uses of water are met;
Water is shared equitably both locally and globally; and
Water productivity is improved where beneficial.
This groundbreaking research tells us that the challenge we face is greater than we thought, yet the results also help us take strides in our understanding of the causes of water scarcity and the way forward to sustainable development.
All graphics can be shared and reproduced, with source and data credits given.
For more news stories on the research, see:
New York Times