Trees are nature's tool for pulling carbon dioxide out of the air, but there aren't enough trees in the world to suck up all the CO2 humans are putting there. That's why researchers are pushing to create artificial leaves to help fight climate change. The World's Ari Daniel visits with two teams of researchers pursuing different approaches to the formidable challenge.
The current crisis is only the beginning for residents displaced by devastating explosions at the Chinese port of Tianjin. Traces of cyanide and other toxic chemicals have been reported in the air, which have prompted further questions and concerns.
With storms intensifying and sea levels rising, the lessons of Katrina are lessons for all of us.
Chemical blasts kill scores of people and destroy a section of an important Chinese port. What safety precautions should be in place to prevent this from happening again — in China or elsewhere.
China is one place where leader don't have to grapple with politics to implement such rules.
One year ahead of the 2016 Summer Games, Rio de Janeiro's Guanabara Bay remains a polluted mess and a serious health hazard for Olympic athletes who are due to compete there. But one biologist in Rio, who says this pollution is a "disruption of the force," isn't giving up on efforts to clean up the bay.
Big game and the death of a lion in Zimbabwe is sparking a very big controversy.
A new report in the British medical journal The Lancet says climate change poses a potentially catastrophic risk to human health. But it also says fighting climate change can bring big health benefits.
In its effort to address a growing water crisis, Peru's capital, Lima, is looking to ancient canals in high mountain villages outside the city.
“Cultural revolution” and “radical change” are terms you might not expect to come out of the Vatican. But that’s language Pope Francis is using to talk about what he says is need to save planet earth and all of humanity along with it.