By the end of the century, the world’s population could grow by more than 3 billion people, to 10.9 billion, a new United Nations analysis found. The predicted growth is slower than the U.N.’s last projection in 2017, because of declining fertility rates. But many regions are still expected to grow rapidly — particularly in sub-Saharan Africa and India — which could exacerbate hunger, poverty and climate change, scientists say. “We don’t have the luxury of picking only one problem to focus on because they’re all coming and they’re all coming together,” the director of the University of Washington’s Climate Impacts Group said. |