Wadi D'uan, a valley in Yemen, is where the world's most sought-after honey can be found. Its hot and dry climate, along with short flowering season of local plants help produce the rich, aromatic honey.
Synthetic fertilizers contribute mightily to climate change. So now there's a growing push in India to return to the ancient practice of using human waste as fertilizer, but with modern sanitary safeguards.
The Great Artesian Basin, which provides drinking water to many communities in the Outback, comes to the surface nearly boiling and stinking of rotten eggs, yet it is a life-giving resource in an unforgiving environment.