Tom Grylls

story on global warming that's happening to huge environmental crises.

If you successfully add them together, the case for action becomes stronger, but sometimes there are barriers to letting that happen in terms of how, for example, the COP negotiation is happening or how the regional frameworks on air pollution are dealing with these problems.

To mention a few other

kind of systematic challenges with taking integrated action on climate change and air pollution, we have the metrics used.

So particulate matter is a great way to understand the impact of health of these particles, of these aerosols in the atmosphere.

But that definition means nothing for climate change because basically it's looking at the size of these particles and the mass of these particles in a volume of air.

This is a really good way for us to understand what's happening to our bodies.

Right.

But from a climate side, we need to know what is making up those particles, which aerosols.

Is it black carbon?

Right.

Is it organic carbon?

Is it sulfates?

So you have this metric which...

has made a lot of progress on the air pollution side, but can be basically meaningless to climate stakeholders.

And that's another thing that I think working on methane, working on black carbon, working on tropospheric ozone can do.

It can be a tactic through which the climate community is thinking about and understanding

what black carbon is doing to the climate, but also on health.

So it's kind of a Trojan horse into the climate space for action on air pollution.

And likewise, thinking about methane from an air pollution perspective is bringing this really important greenhouse gas into what the air pollution community is talking about.