People already care very-little about this problem enough to convince their governments to do something about it. That applies to the Indian populace, as well a

People already care very-little about this problem enough to convince their governments to do something about it. That applies to the Indian populace, as well as other countries that aren't currently pressuring/sanctioning/bombing India to prevent a biological disaster (so we're told). So I don't really see how your criticism against Libertarianism applies here because governments are letting it happen right now. It's only you, and what appears to be a minority of individuals, that cares about it. If it were a majority, then Democracy would be fixing it right now, right? And, to answer your actual question: I can't answer it for every single person out there. That's how non-government solutions look like. Each individual voting, acting and caring about each specific problem in his or her own way. Libertarianism is the ultimate form of Democracy in that regard.