Most leading scientists on this issue have already distanced themselves from the WWF report.  GHG emissions from desalination are minute.  The big issues are the damage done to ecosystems, but that continues to be addressed as the technology advances.

Here in Melbourne, where the desalination plant has been announced, there have been heavy restrictions on water use for a long time.  There are major concerns that these restrictions in themselves may be insufficient.  Billions of dollars are now to be invested in various measures (including the desalination project) to try to ensure a steady water to supply to the 3-4 million people living in Melbourne.
Seems fair enough to me.

The simple fact and the only one that makes a difference,wether it be amounts of food,war,lack of energy,pollution,or any other of the woes of the world is.........OVERPOPULATION!!!!!!!!!!!!!