Tim Mohin

Tim Mohin became the first CEO of the Greenhouse Gas Protocol in 2026, overseeing a framework used by approximately 97% of disclosing S&P 500 companies to measure and report corporate emissions. In taking on that job, Mohin is responsible for bringing together diverse voices to harmonize greenhouse-gas accounting rules in the face of pushback from some companies and government officials. Mohin’s appointment puts him at the center of an effort to make emissions reporting more consistent across markets, an important effort given that these types of rules shape how companies set climate targets and how regulators and investors assess progress.

What is the single most important action you think the public, or a specific company or government, needs to take in the next year to advance the climate agenda?

The most important action a corporation can take is to establish a robust greenhouse gas inventory and use it to guide decision making. This is the essential foundation for decarbonization because you cannot manage what you do not measure. High-quality emissions data gives companies, governments, and investors the information they need to prioritize action, direct resources effectively, and track real progress toward ambitious emissions reductions targets.

What’s one sustainability effort you personally will try to adopt in the next year?

In the next year, I am committed to bicycling when possible, instead of transit by car. I’ve been an avid cyclist for years, and frequently cycle recreationally, but want to expand this practice into commuting and day-to-day travel around the city. Pittsburgh, where I’m based, is a particularly hilly city so this will be good exercise as well as being good for the planet.

What gives you hope about the future of the planet?

What gives me hope is the spirit of collaboration I’m seeing across the climate movement. Climate change is a global challenge, and increasingly we are seeing standards bodies, governments, businesses, and civil society looking for ways to align their efforts. The partnership between the International Organization for Standardization (ISO) and the Greenhouse Gas (GHG) Protocol is a good example of this spirit of collaboration in action. ISO and GHG Protocol are working together to align their emissions accounting and reporting standards, with the goal of one harmonized, global carbon accounting system.