I'm not a fan of mass death, mind you. But Trump will at least assure it happens to other people.
No, Trump will ensure it happens to everyone, by wiping out all the federal environmental protections in the US and allowing the atmosphere to be pumped full of god-knows-what pollutants, likely making the planet too hot for humans to inhabit within the lifetime of anyone under 50, certainly 40.
Obama will start the process, however, by ramming the TPP through in the lame-duck session (aided and abetted by other corporatist shill traitors like Justin Trudeau and Christy Clark), which will allow multinational corporations to sue jurisdictions over most any law (including environmental protections) that cuts into their profits, both overturning the law and bankrupting the jurisdiction in question by forcing them to make up the lost profits. This would be done in an international court from which there would be no appeal.