PLEA Network

23 May 2024, The Conversation: What is ‘Net Zero’, anyway? A short history of a monumental concept. Last month, the leaders of the G7 declared their commitment to achieving net zero emissions by 2050 at the latest. Closer to home, the Albanese government recently introduced legislation to establish a Net Zero Economy Authority, promising it will catalyse investment in clean energy technologies in the push to reach net zero. Pledges to achieve net zero emissions over the coming decades have proliferated since the United Nation’s 2021 Glasgow climate summit, as governments declare their commitments to meeting the Paris Agreement goal of holding global warming under 1.5°C. But what exactly is “net zero”, and where did this concept come from? Stabilising greenhouse gases In the early 1990s, scientists and governments were negotiating the key article of the UN’s 1992 climate change framework: “the stabilization of greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic [human-caused] interference with the climate system”. How to achieve that stabilisation – let alone define “dangerous” climate change – has occupied climate scientists and negotiators ever since. From the outset, scientists and governments recognised reducing greenhouse gas emissions was only one side of the equation. Finding ways to compensate or offset emissions would also be necessary. The subsequent negotiation of the Kyoto Protocol backed the role of forests in the global carbon cycle as carbon sinks. Read more here