BBC: Restricting population growth will not solve global issues of sustainability in the short term, new research says.
A worldwide one-child policy would mean the number of people in 2100 remained around current levels, according to a study published in the Proceedings of the National Academy of Sciences.
Even a catastrophic event that killed billions of people would have little effect on the overall impact, it said.
There may be 12 billion humans on Earth by 2100, latest projections suggest....