Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Climate change puts forty percent more people at risk of absolute water scarcity

17.12.2013
Water scarcity impacts people’s lives in many countries already today. Future population growth will increase the demand for freshwater even further.

Yet in addition to this, on the supply side, water resources will be affected by projected changes in rainfall and evaporation. Climate change due to unabated greenhouse-gas emissions within our century is likely to put 40 percent more people at risk of absolute water scarcity than would be without climate change, a new study shows by using an unprecedented number of impact models.

The analysis is to be published in a special issue of the Proceedings of the National Academy of Sciences that assembles first results of the Inter-Sectoral Impact Model Intercomparison Project (ISI-MIP), a unique community-driven effort to bring research on climate change impacts to a new level.

“The steepest increase of global water scarcity might happen between 2 and 3 degrees global warming above pre-industrial levels, and this is something to be experienced within the next few decades unless emissions get cut soon,” says lead-author Jacob Schewe of the Potsdam Institute for Climate Impact Research. “It is well-known that water scarcity increases, but our study is the first to quantify the relative share that climate change has in that, compared to – and adding to – the increase that is simply due to population growth.”

Today, between one and two people out of a hundred live in countries with absolute water scarcity. Population growth and climate change combined would increase this to about ten in a hundred at roughly 3 degrees global warming. Absolute water scarcity is defined as less than 500 cubic meters available per year and person – a level requiring extremely efficient water use techniques and management in order to be sufficient, which in many countries are not in place. For a comparison, the global average water consumption per person and year is roughly 1200 cubic meters, and significantly more in many industrialized countries.

As climate change is not uniform across the world, the regional differences of its impacts on water availability are huge. For example, the Mediterranean, Middle East, the southern USA, and southern China will very probably see a pronounced decrease of available water, according to the study. Southern India, western China and parts of Eastern Africa might see substantial increases.

“Water scarcity is a major threat for human development, as for instance food security in many regions depends on irrigation – agriculture is the main water user worldwide,” says co-author Qiuhong Tang of the Chinese Academy of Sciences. “Still, an increase of precipitation is also challenging – the additional water may cause water logging, flooding, and malfunctioning or failure of water-related infrastructure. So the overall risks are growing.” Moreover, many industrial production processes require large amounts of water, so a lack thereof in some regions hampers economical development.

This study is based on a comprehensive set of eleven global hydrological models, forced by five global climate models – a simulation ensemble of unprecedented size which was produced in collaboration by many research groups from around the world. Hence, the findings synthesize the current knowledge about climate change impacts on water availability. The cooperative ISI-MIP process systematically compares the results of the various computer simulations to see where they agree and where they don’t. The results quoted above represent the multi-model average. So some of the models indicated even greater increases of water scarcity.

“The multi-model assessment is unique in that it gives us a good measure of uncertainties in future impacts of climate change – which in turn allows us to understand which findings are most robust,” says co-author Pavel Kabat of the International Institute for Applied Systems Analysis (IIASA). “From a risk management perspective, it becomes very clear that, if human-made climate change continues, we are putting at risk the very basis of life for millions of people, even according to the more optimistic scenarios and models.”

However, he added, the job is far from being done. “We need to do additional research on how the water requirement portfolio will develop in the future in different sectors like agriculture, industry, and energy – and how, in addition to reducing greenhouse-gas emissions, the technological developments in the water sector may help alleviating water scarcity.”

Article: Schewe, J., Heinke, J., Gerten, D., Haddeland, I., Arnell, N.W., Clarke, D.B., Dankers, R., Eisner, S., Fekete, B.M., Colón-González, F.J., Gosling, S.M., Kim, H., Liu, X., Masaki, Y., Portmann, F.T., Satoh, Y., Stacke, T., Tang, Q., Wada, Y., Wisser, D., Albrecht, T., Frieler, K., Piontek, F., Warszawski, L., Kabat, P. (2013): Multi-model assessment of water scarcity under climate change. Proceedings of the National Academy of Sciences (early online edition) [DOI:10.1073/pnas.1222460110]

Along with this article, further ISI-MIP results are published online by PNAS:

Dankers, R., et al. (2013): First look at changes in flood hazard in the Inter-Sectoral Impact Model Intercomparison Project ensemble. Proceedings of the National Academy of Sciences (early online edition)

Elliott, J., et al (2013): Constraints and potentials of future irrigation water availability on agricultural production under climate change. Proceedings of the National Academy of Sciences (early online edition)

Friend, A. D., et al. (2013): Carbon residence time dominates uncertainty in terrestrial vegetation responses to future climate and atmospheric CO2. Proceedings of the National Academy of Sciences (early online edition)

Haddeland I., et al. (2013): Global water resources affected by human interventions and climate change. Proceedings of the National Academy of Sciences (early online edition)

Nelson, G. C., et al. (2013): Climate change effects on agriculture: Economic responses to biophysical shocks. Proceedings of the National Academy of Sciences (early online edition)

Piontek, F., et al. (2013): Multisectoral climate impact hotspots in a warming world. Proceedings of the National Academy of Sciences (early online edition) [DOI:10.1073/pnas.1222471110]

Prudhomme, C., et al. (2013): Hydrological droughts in the 21st century, hotspots and uncertainties from a global multimodel ensemble experiment. Proceedings of the National Academy of Sciences (early online edition)

Rosenzweig, C., et al. (2013): Assessing agricultural risks of climate change in the 21st century in a global gridded crop model intercomparison. Proceedings of the National Academy of Sciences (early online edition)

Schellnhuber, H.J., et al (2013): The Elephant, the Blind, and the ISI-MIP. Proceedings of the National Academy of Sciences (early online edition)

Warszawski, L., et al. (2013): The Inter-Sectoral Impact Model Intercomparison Project (ISI-MIP): Project framework. Proceedings of the National Academy of Sciences (early online edition)

For further information please contact:
PIK press office
Phone: +49 331 288 25 07
E-Mail: press@pik-potsdam.de
Twitter: @PIK_Climate
Weitere Informationen:
http://www.pnas.org/cgi/doi/10.1073/pnas.1222460110

Jonas Viering | PIK Pressestelle
Further information:
http://www.pik-potsdam.de

More articles from Earth Sciences:

nachricht Ice cave in Transylvania yields window into region's past
28.04.2017 | National Science Foundation

nachricht Citizen science campaign to aid disaster response
28.04.2017 | International Institute for Applied Systems Analysis (IIASA)

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Fighting drug resistant tuberculosis – InfectoGnostics meets MYCO-NET² partners in Peru

28.04.2017 | Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

 
Latest News

Wireless power can drive tiny electronic devices in the GI tract

28.04.2017 | Medical Engineering

Ice cave in Transylvania yields window into region's past

28.04.2017 | Earth Sciences

Nose2Brain – Better Therapy for Multiple Sclerosis

28.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>