[Yo-Yo]

To be clear, they're talking about air conditioning refrigerant.

From the article:

Daimler issued a statement saying that the research was "too restrictive". The carmaker said that its preferred option is to develop air-conditioning systems that use carbon dioxide as a refrigerant. Development of such a system, however, could take years.

I suppose that using carbon dioxide as a refrigerant would have the same impact as CO₂.

[Olog-hai]

Not like Reuters to be clear. There’s a huge difference between engine coolant and air-conditioning refrigerant.