Please click on the regions of the map below to see details on the case studies.

UNESCO: World Water Assessment Program (WWAP)

Click on the interactive map below showing state estate and inheritance taxes for 2013.

FORBES: Four Ways To Beat State Death Taxes

Fay and pilot Peter Ragg followed a general map of the "human footprint" on the continent while automatic cameras snapped a photo of the ground below every 20 seconds.

NPR: African Flyover Reveals Impact of 'Human Footprint'