Ramaswami: Today the world is occupied by Covid-19 and the changes unleashed by the efforts to check its spread, but this should not draw our attention away from the other most critical threats before the planet. These threats must be addressed, for the world will soon be grappling with a post-Covid-19 scenario. At that time, our steps must keep all those pathways in mind which can supplement our efforts to repair the damage caused by Covid-19, while not neglecting longer-term looming crises. Two of these global problems are increasingly becoming more and more serious. First, the proliferation of weapons of mass destruction, or WMDs. No doubt these are the most serious and obvious threats, but several experts are also pointing to fast-increasing threats from robotic or AI weapons as well, and there are warnings about other highly-destructive weapons including chemical and biological weapons.