World at high risk due to the credibility gap in net-zero climate targets: Study

National climate policies currently in play around the world fall short of the promises made, opening the potential for global targets to be missed by a large margin, the study finds

In a recent study published in Science,  an international team of researchers evaluated the credibility of various countries’ net-zero pledges and long-term goals. They ranked 90% of global net-zero greenhouse gas emissions pledges as providing low confidence in their full implementation.

The study said that the confidence rating of achievement of net-zero target for India is lower. India has set a target of achieving net-zero by 2070. However, this is not legally binding. The net-zero target is part of a long-term strategy (LTS) submitted to UNFCCC in November 2022 but not enshrined in law. Moreover, no policy plan has been published as of November 2022.

The UAE, set to host COP28 later this year, landed at the bottom of the scale in the “much lower” confidence category with its net-zero by 2050 target. The target is not legally binding, no policy plan has been published for it, there is no indication of near-term emissions reductions, the study added. 

Lead researcher Joeri Rogelj, director of research for the Grantham Institute at Imperial College London, said, “Climate policy is moving from setting ambitious targets to implementing them. However, our analysis shows most countries do not provide high confidence that they will deliver on their commitments. The world is still on a high-risk climate track, and we are far from delivering a safe climate future.”

Assessing climate action plans 

According to the study, most countries have set net-zero goals and Nationally Determined Contributions (NDCs) — non-binding national plans proposing climate actions. Taking these plans at face value, and assuming they will all be fully implemented, gives the world a chance of keeping warming to 1.5-2°C. But taking current policies only, with no implementation of net-zero pledges, means models predict temperature rises could be as much as 2.5-3°C by 2100, with warming still increasing.

To reduce the uncertainty in which of these scenarios is likely to happen, the team, including researchers from the UK, Austria, USA, Netherlands, Germany, and Brazil, assigned a ‘confidence’ to each net-zero policy. They assessed 35 net-zero targets, covering every country with more than 0.1% of current global greenhouse gas emissions.

The confidence assessment was based on three policy characteristics: whether the policy was legally binding, whether there was a credible policy plan guiding implementation, and whether short-term plans would already put emissions on a downward path over the next decade.

Based on this, policies were given ‘higher’, ‘lower’ or ‘much lower’ confidence of being fully implemented. Some regions scored highly, including the European Union, the United Kingdom and New Zealand, but around 90% scored ‘lower’ or ‘much lower’ confidence, including China and the US, which together account for more than 35% of current emissions.

Modelling emissions

From this assessment, the team modelled five scenarios of future greenhouse gas emissions and resulting temperatures. These were considering only current policies (the most conservative scenario); only adding in policies that have a high confidence of being implemented; adding policies with high and low confidence; adding all policies regardless of confidence as if they are implemented; and a scenario where all policies are fully implemented and all NDCs are met (the most forgiving scenario).

The most conservative scenario had the largest uncertainty, with a range of 1.7-3°C and a median estimate of 2.6°C. The most optimistic scenario has a range of 1.6-2.1°C, with a median estimate of 1.7°C. This might suggest that, if all net-zero policies are fully implemented, the Paris Agreement goals are within reach. However, with so many policies ranked in the low-confidence end of the scale, this would be wishful thinking in absence of further efforts.

Co-author Taryn Fransen, from the World Resources Institute in Washington DC, and the Energy and Resources Group at the University of California-Berkeley, said,“Climate change targets are by their nature ambitious. There’s no point in setting a target for a foregone conclusion. But implementation must follow.”

Catalysing action

Only 12 out of 35 net-zero policies are currently legally binding, and the researchers said that increasing this number would help ensure the policies survive long-term and catalyse action. Countries also need clear implementation pathways for different sectors, outlining exactly what changes are needed and where the responsibility lies.

Co-author Robin Lamboll, from the Centre for Environmental Policy at Imperial, said, “Making targets legally binding is crucial to ensure long-term plans are adopted. We need to see concrete legislation in order to trust that action will follow from promises.”

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