text:  Why is that? In my personal opinion, I think over the years that I've worked on this particular pollutant, it seems to me that black carbon is either considered to be an environmental pollutant or an air pollutant. And because it sits in the middle of the two, the civil society and the government, neither of them have actually focused on it. And we need to reduce black carbon emissions anywhere between 30 to 35 percent by 2030.