The enigmatic "cenotes" of Mexico's Yucatán peninsula
Some of these sinkholes may have been formed by the impact of a meteorite around 65 million years ago. Here are the "cenotes" of Mexico's Yucatán peninsula.
Interview: This woman chose not to have any kids
Sri Lanka: new measures against deforestation
This temple in India is home to "extinct" turtles
These people joined the "fertile disobedience" movement to protect nature
Drugs and pesticides: a pollution invisible to the naked eye
These French students are bringing nature to their campus