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In Vitro Corals

Frustrated by vanishing reefs, scientists are fertilizing coral sperm and eggs in labs and returning them to the wild.

Algae Alchemy

Two Dutch designers are processing live algae into material that can be used for 3-D printing of such items as shampoo bottles and trash bins.

Pooch Patrol

Thailand’s stray dogs could become community watches with a new “smart vest” that transmits videos of what a barking dog sees.

Man-Made Meat

Pet food being grown in a start-up laboratory would slash land use by 99 percent and produce 90 percent fewer greenhouse gas emissions.

Big Save

A massive pioneering program in Brazil will protect more than 231,000 square miles in the Amazon River basin by tying local economies to conservation measures.

Natural Pools

Natural pools, which may be built of stone and clay and filtered with aquatic plants, turn out to be both eco-friendly and price competitive compared to conventional swimming pools.

Lower Overhead

Cincinnati has purchased 100 percent renewable energy to operate most of its municipal buildings through at least 2021, cutting its utility rates by more than $100,000 annually.

Independent Action

More than 50 mayors from around the globe have signed the Chicago Climate Charter, intended to guide cities toward reaching greenhouse gas emissions reductions similar to those targeted in the Paris climate accord.

Quick Quarters

Harnessing technology and cleverness, homebuilding startups in the Ukraine, Italy and Lebanon are offering tiny, energy-neutral, quick-built houses at low cost.

Deadly Cargo

The Iranian tanker Sanchi oil spill in the East China Sea has scientists worried about unknown impacts caused by the toxic nature of the ultra-light, highly flammable oil.

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