THE British government has announced it will invest almost £22 billion in carbon capture and storage (CCS) projects over the next 25 years. The technology works by capturing CO₂ as it is being emitted by a power plant or another polluter, then storing it underground. 

This sounds great in theory. However, it seems Labour has been swayed by the fossil fuel lobby, which has pushed CCS for years. This announcement represents a massive bet on a still unproven technology, and will lock Britain into fossil fuel dependence for decades to come. The Climate Change Act mandates that Britain should achieve net zero emissions by 2050, yet this will be impossible if carbon capture leads to Britain building new gas power stations instead of wind and solar farms.

I was one of several leading climate scientists who recently signed a letter to the energy security and net zero secretary, Ed Miliband, in which we pointed out the many issues with the current plans. 

Even if the technology worked perfectly, it still locks Britain into a reliance on natural gas (which is basically methane, a potent greenhouse gas) for generations to come. This will result in Britain being reliant on imported natural gas past 2050, which has significant upstream emissions from methane leaks, transport and processing.

That then exposes Britain to the continued volatility of the global energy markets, which in part caused the country’s cost of living crisis. (Renewables don’t have this problem, since the wind and sun don’t need to be imported from overseas). 

Overpromising, underdelivering

In the letter, we pointed out that carbon capture projects have a very poor track record of overpromising and underdelivering. Most current CCS capacity is within natural gas processing facilities, where CO₂ must be separated out to produce marketable products. Almost 80 per cent of the CO₂ captured is reinjected into oil fields to facilitate oil extraction.

The track record of adding carbon capture to power plants is much worse, with the vast majority of projects abandoned. Just two commercial-scale coal-fired power plants are operating with CCS: Boundary Dam in Canada and Petra Nova in the US. Both have experienced consistent underperformance, recurring technical issues and ballooning costs.

In any case, Britain just closed down its last coal power plant. And it’s actually harder to capture CO₂ from gas power plants than from coal, since CO₂ is found in lower concentrations in the emitted gases.

One argument for CCS is that it can be used in the production of so-called “blue hydrogen,” which is derived from natural gas and can in theory be used to heat homes or power cars. Yet many projects doing this around the world have been abandoned. 

A wide range of uses have been promoted for hydrogen, but not all are practical or competitive. The claim that hydrogen should have a significant role in heating buildings has been comprehensively disproved, while direct electrification is increasingly emerging as a better solution for industrial process heating.

Better ways to spend £22 billion

That £22bn earmarked for CCS projects should instead be invested in proven technologies such as renewable energy, and on upgrading Britain’s national grid. 

We do not deny that both carbon capture and “green” hydrogen (derived from water not methane) may be needed for specific uses in a zero-carbon economy.

Carbon capture and storage should be used on existing fossil fuel infrastructure to reduce its emissions as it is phased out, while green hydrogen will be an important way of storing and transporting green energy around the world. It will also be essential to reduce the emissions from steel production. 

But the science is very clear: it makes no sense to use hydrogen as a way of heating buildings or driving our transport systems.

As the world leaders agreed and declared at the most recent UN climate summit, Cop28 in Dubai, we must transition away from fossil fuels in a just, orderly and equitable manner in order to achieve net zero by 2050.

This will not happen if Britain and other countries lock themselves into a fossil fuel-based pathway with inevitable upstream emissions, displacing genuinely zero or low-carbon electricity generation.

Mark Maslin is professor of natural sciences at University College London.

This article is republished from theconversation.com under a Creative Commons licence.