Very high birthrates in places like Niger mean the country's own limited resources must be shared among more people - a particular problem as climate change disrupts farming and herding, threatening food supplies.
At Fleurhof dam, one of many water sources across South Africa of spiritual significance, children run along the water carrying green and blue flags representing their churches. But researchers and scientists warn that contamination from nearby open mine sewage and waste puts worshippers at risk of water poisoning.
Jane Worthington moved her grandkids to protect them from oil and gas wells—but it didn't work. In US fracking communities, the industry's pervasiveness causes social strain and mental health problems.