No it won't. It's the privatization of water supplies that will deny people water. Two articles...

Climate change could cut clean water to three billion people: report

Almost half of humanity could lose clean water access due to climate change, according to a British report to be released tomorrow ahead of an international climate change conference in Mexico.

Link:
http://www.rawstory.com/rs/2010/11/climate-change-cut-clean-water-billion-people-report/

Meanwhile, as the planet continues to cool, we get more scare tactics about global warming...

Cancun climate change summit: scientists call for rationing in developed world

Global warming is now such a serious threat to mankind that climate change experts are calling for Second World War-style rationing in rich countries to bring down carbon emissions.

Link:
http://www.telegraph.co.uk/earth/copenhagen-climate-change-confe/8165769/Cancun-climate-change-summit-scientists-call-for-rationing-in-developed-world.html