Last week, WPP’s GroupM announced an updated version of its carbon calculator, based on the media decarbonization methodology released last July. It lets agencies estimate the carbon emissions of a client’s campaign based on the breakdown of the media buy, using channel-level emissions data.

While GroupM is a leader in this space, making its methodology available industrywide, it’s not the only player working to measure and rein in the carbon emissions associated with its products.