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US regaining climate lead

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President’s pledge to cut emissions puts pressure on others to target net-zero

President Joe Biden’s pledge to halve US net greenhouse-gas emissions by 2030 is less ambitious than the EU or UK pledges but shows Washington’s wish to regain global climate leadership after four years in the cold. It gives the US clout in climate diplomacy and puts pressure on other major emitters to align their 2030 targets to a net-zero pathway.

The Paris Agreement, which the US re-joined this year, aims to limit global warming to 2°C or, even better, 1.5°C, above pre-industrial levels. And the UN’s Intergovernmental Panel on Climate Change says the world needs to achieve net-zero emissions by 2050 to stay within 1.5°C.

The US pledge of a 50%-52% emissions reduction from 2005 levels aligns to net-zero pathways. It is roughly equivalent to a 42% to 45% reduction from 1990 levels.

The target is economy-wide, with the president mentioning buildings, transport, industry and agriculture while aiming for zero-carbon electricity by 2035.

However, it is a net target. Net-zero allows sources of emissions such as fossil-fuel combustion to be balanced against sinks such as forestry or carbon capture. So the US can still emit greenhouse gases so long as the net impact on atmospheric concentrations is zero.

Achieving net-zero across the US economy will not be easy. On our calculations, a continuation of the 5%-5.4% decarbonisation rate from 2030 would mean only an 82%-84% emissions reduction in 2050.

That suggests the US needs carbon offsets. The president mentioned the enhancement of carbon sinks through “nature-based solutions for ecosystems ranging from our forests and agricultural soils to our rivers and coasts” and also “ocean-based solutions”.

His April announcement made no mention of a national carbon-pricing programme such as emissions trading, but having previously announced the re-instatement of its social cost of carbon, starting at $51 a tonne, we expect an updated version early in 2022 at a much higher rate.

There was also no direct reference to climate finance, but the president has already asked for $2.5bn for international climate programmes and $1.2bn for the UN’s Green Climate Fund: that shows the US is not just helping itself, but also helping developing economies, and hence the world, to move towards net-zero.

The US announcement means around 25 economies have net-zero pathway alignment plans, with about half of global emissions under some form of net-zero pledge or alignment.

There were calls for even greater US emissions cuts – the EU is targeting at least 55% from 1990 levels and the UK a 68% decline from that date, hopefully rising to 78% by 2035. Mainland China has no absolute reduction plan for 2030 yet, but there is growing pressure on larger emitters to make net-zero pledges.

The global climate process is regrouping following a pandemic-induced pause. This US pledge should be a catalyst for other parties to commit to more ambitious climate pledges and actionable policies, with many more businesses responding by aligning their operations to a net-zero pathway.

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