A microscopic look at why the world is running out of sand; Video
The usefulness of sand depends on the science of each tiny little grain. We went on a sand scavenger hunt to collect some samples, look at them under a microscope, and try to figure out why sand scarcity is such a problem.
‘Art can play a valuable role’: climate change installations appear in New York
The existential threat of climate change is being spelled out to New Yorkers via a selection of flashing highway signs that have been placed around the city.
New walls aim to hold back rising seas off Tanzania
Coastal erosion and flooding threaten Dar es Salaam, one of Africa’s fastest-growing cities.