"Cities, agriculture and ecosystems..."

This week the Obama administration released the third U.S. National Climate Assessment, analyzing and predicting the effect of climate changes on the different regions and economic sectors of America.  The first sentence of the Southwest regional section reads:

"Snowpack and streamflow amounts are projected to decline in parts of the Southwest, decreasing surface water supply reliability for cities, agriculture, and ecosystems."

-Source:  http://www.globalchange.gov/explore/southwest

Cities, agriculture and ecosystems.... 

Who can we shortchange?  The answer should be obvious: no one.  All three are of vital importance, economically and culturally.  The only option is increased efficiency through technology and innovation.  Do dams create more water?  No.  They actually loose some, through evaporation.  Do tunnels under the delta create water? No.  We  need to address the primary problem, which is how to do more with less.