Humans are the most obnoxious pollutant of the planet.  In fact they are the planet's cancerous species, which overwhelms, encroach in to the territories of, and live at the expense of other species.  The only way the planet (minus the humans) can survive is by allowing the global warming, and  to run its full course.
Emission control is Utopian goal, and natural culling of humans is realistic and humane way.