Jianguo "Jack" Liu

Red knots stop to feed along the Delaware shore as they migrate from the high Arctic to South America. Gregory Breese, USFWS/Flickr

Protecting 30% of Earth’s surface for nature means thinking about connections near and far

Governments, scientists and conservation groups are working to protect 30% of Earth’s land and water for nature by 2030. Two scientists explain why scale matters for reaching that goal.
Sand for use in hydraulic fracturing operations at a processing plant in Chippewa Falls, Wisconsin in 2011. AP Photo/Steve Karnowski)

The world is facing a global sand crisis

Overuse of sand for construction and industry is harming the environment and fueling violence around the world. Scientists explain why we need international rules to regulate sand mining and use.

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