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Just after dawn in the Salinas Valley south of San Francisco, a raucous robot rolls through a field spitting clouds of vapor. It’s cutting lettuce heads with water knives—super-high-pressure beams—and gobbling up the produce. The heads roll up its mouth and onto a conveyor belt, where workers in hoodies and aprons grab the lettuce and tear off the loose leaves.

Delivering packages with drones can reduce carbon dioxide emissions in certain circumstances as compared to truck deliveries, a new study from University of Washington  transportation engineers finds.

In a paper to be published in an upcoming issue of Transportation Research Part D, researchers found that drones tend to have carbon dioxide emissions advantages over trucks when the drones don’t have to fly very far to their destinations or when a delivery route has few recipients.

Trucks — which can offer environmental benefits by carrying everything from clothes to appliances to furniture in a single trip — become a more climate-friendly alternative when a delivery route has many stops or is farther away from a central warehouse.

While bidets remain unpopular in America, they’re a familiar fixture in bathrooms all over the world. And they raise an inevitable question: Is it better for the environment if you wipe, or should you wash instead?

The answer may surprise you — and could lead you to rethink your next bathroom remodel.

Researchers from the Coral Reef Ecology Lab at the Hawai‘i Institute of Marine Biology documented the third global bleaching event as it occurred from 2014 to 2016 at the Hanauma Bay Nature Preserve (HBNP) on the island of O‘ahu, Hawai‘i.

Poaching, illegal fishing and deforestation are threatening more than quarter of UNESCO’s World Heritage sites, according to a report by the WWF  (World Wide Fund for Nature) — and the consequences are not just environmental.

The report states that 18 out of the 50 threatened sites are in Latin American countries such as Argentina, Brazil, Colombia, Ecuador, Honduras, Panama and Peru. It also says the number could be higher because the illegal extraction of species in the region — a business with annual profits of almost US$ 2 billion — is not as well studied as it is in Africa or Asia.