Natural Filters: Mussels Deployed To Clean Up Polluted Waterways
A stream with a healthy population of mussels indicates a pretty pristine habitat and good water quality. Everywhere, however, numbers of mussels are in peril. Everywhere the causes of decline are the same: alteration and damming of streams and rivers, and human-induced runoff of silt and nutrients.
Why Dangerous Sinkholes Keep Appearing Along the Dead Sea
For millennia, the salty, mineral-rich waters of the Dead Sea have drawn visitors and health pilgrims to its shores. But in recent years, gaping chasms have been opening up without warning along its banks, posing a threat to such visitors and tourism in general.
What the Earth Would Look Like if all the Ice Melted, Video
As National Geographic showed us in 2013, sea levels would rise by 216 feet if all the land ice on the planet were to melt. This would dramatically reshape the continents and drown many of the world’s major cities.