Share '"Water: Our Thirsty World" free download til 4/2 from National Geographic'

This single-topic issue of National Geographic magazine highlights the challenges facing our most essential natural resource. "Water: Our Thirsty World" is available for free download starting on World Water Day, March 22, and extending through April 2, 2010. This interactive edition of National Geographic magazine presents complete content from the print edition, plus extra photo galleries, rol…