Pollution where deployed isn't the issue, overall pollution is (the main impact of CO2 is climate change on a global scale). Significant reductions in pollution are to be celebrated, but it's wrong - and takes away from your point - to emphasise something as "zero emission" when it isn't.
I think inhabitants of large Chinese cities that have to wear masks when they go for a walk would disagree.
Actually, both things are quite relevant. Pollution in cities poisons and kills people in the short run, climate change would kill us all in the long run.