Thirty-two years after becoming the first man to walk to both poles, Robert Swan teamed up with his son Barney for another first: trekking to the South Pole using only renewable energy.
Millet is no longer a popular staple food in China, but the drought-tolerant crop is playing a role in controlling desertification in the Inner Mongolia autonomous region.
More than 20 nations ranging from Germany, France and Britain to Pacific island states said on Thursday they planned to "lead from the front."
Heatwaves are already a bigger risk in many cities than people realise, experts say.
Indonesia's national commission on human rights has vowed to investigate the death of a journalist who was being held on charges of defaming a palm oil company owned by a powerful tycoon.