New Carbon Impacts Tracer Quantifies Real-World Damage from Fossil-Fuel Emissions

The Carbon Impacts Tracer translates the amount of carbon dioxide released by a project, company or jurisdiction into estimated climate-related harms. Using the Transient Climate Response to CO2 Emissions (TCRE) metric—approximately 0.45 °C of warming per billion tonnes of CO2—the model calculates impacts across eight factors, such as reduced crop yields, lost labour hours, glacier retreat, coral mortality and food-production loss. For the proposed HVO coal mine in New South Wales, the tracer estimates that the additional heat trapped by its emissions would cut annual crop production by an amount equal to the minimum dietary needs of roughly 276,000 people.

The Guardian

The tracer was created by scientists at the Australian National University, the Australian Research Council Centre of Excellence for the Weather of the 21st Century and the Lethal Humidity Global Council. Funding came from the Minderoo Foundation. Maria Nawaz, who leads the Australian Climate Accountability Project at the Australian Human Rights Institute (University of New South Wales), is a project partner.

The Guardian

The NSW Independent Planning Commission is slated to decide this week whether to allow the HVO mine to operate until 2045. By feeding the mine’s projected emissions into the tracer, stakeholders can now see a quantified link between the mine’s output and specific socioeconomic harms, a connection previously described as “a drop in the ocean.” Proponents argue the tool will help hold large emitters accountable and inform regulatory reviews.

The Guardian

Prof Sarah Perkins-Kirkpatrick, a climate scientist at the Australian National University, emphasized that “every tonne of CO2 matters” and that the tracer is intended to provide high-confidence evidence rather than to assign blame. Maria Nawaz described the model as “transformative” for climate litigation, allowing plaintiffs to tie emissions to concrete human and ecological damages.

The Guardian

Climate lawyer Elaine Johnson, director of Johnson Legal, warned that fossil-fuel firms are likely to resist the tool because it can link their products to outcomes such as heat-wave deaths. The Guardian’s request for comment from Glencore, a partner in the HVO mine, went unanswered.

The Guardian

• “Small numbers in global warming can mean catastrophic impacts,” — Prof Sarah Perkins-Kirkpatrick, a climate scientist at the Australian National University

The Guardian