Pune-based couple Riddhi and Rakesh (names changed on request) have decided not to have children, not because of time or money constraints, but because they are worried about an uncertain world threatened by heatwaves, droughts, floods and acute water shortage among other disasters. “I think children will not have access to even the basics in the next 30 to 40 years, which will not be fair on them,” says Riddhi, who works with an IT company.