A carbon tax may not actually do a whole lot for emissions

There's a chicken/egg problem at work.

A carbon tax is most economists' favourite method of dealing with climate change. It is exactly the sort of simple, market-driven intervention that they tend to like: set a price per tonne of carbon emitted which is equal to the value of the damage that tonne does to the climate, and then sit back and what businesses and consumers react. Some may cut their usage; some may switch to low-carbon sources of energy, which suddenly become cheaper comparatively; and some may choose to just pay the extra cost (what happens in that last situation is debatable – some think the money should just count as general taxation, others that it should be put towards climate change prevention and mitigation).

The Washington Post's Brad Plumer suggests that it may not work as well as we would hope, however. He reports on a recent MIT study looking at the likely effect of a $20 a ton carbon tax in the real world – the value proposed by a pair of MIT researchers last month.

Plumer writes:

Sebastian Rausch and John M. Reilly of the MIT Global Change Institute recently put forward a proposal for a $20/ton carbon tax that would rise 4 percent each year, starting in 2013. (The funds would be used to offset taxes elsewhere.) Here’s what their economic model predicts would happen to U.S. greenhouse-gas emissions:

Blue line: MIT reference case with no carbon tax. Black line: EIA reference. Green line: Scenario with MIT carbon tax in place.

With a carbon tax in place, U.S. greenhouse gas emissions do start declining quite a bit (this is the green line). But by 2030, emission levels stall, even though the carbon tax keeps rising and rising each year. The United States wouldn’t get anywhere near the 80 percent cut by 2050 that the White House has envisioned.

One explanation here is that MIT’s proposed carbon tax just isn’t high enough. But Muro favors another possibility–that a carbon tax alone isn’t enough to drive deep reductions. The private sector tends to under-invest in energy R&D and key bits of infrastructure such as transmission lines. Without further policies, it’s unlikely that we’ll see a sweeping transformation of our energy system to give people alternatives to coal plants and gasoline-powered cars.

This echoes an argument I've heard several times from those on the more technical side of climate change prevention. For all that the economists and politicians like to talk about creating the conditions in which the private sector will be incentivised to help tackle climate change, those who are more keenly aware of the massive costs involved tend to be rather more pessimistic.

They point out that the carbon tax model provides a cash injection to providers of low-carbon energy – but only after the tax is already instituted. As a result, there's another weak link in the chain, which is the ability of those providers to secure loans to build the capacity required. That's possible for massive companies looking to get into a new area; and it's possible for smaller companies, provided they get enough certainty from the government to be able to convince bankers.

But the fear is that larger companies, already strongly embedded in the conventional energy infrastructure, have little incentive to devote money, which could be used to lower the cost of polluting fuels, to instead build new capacity; and smaller companies won't be left with enough time between when the government finally confirms a carbon tax, and when their new generation is actually needed.

At the same time, though, there is growing evidence that some companies really are going above and beyond the call of duty. Some of it may be greenwashing, and some may be token expenditure, but if there really is any sizeable investment in low-carbon infrastructure, then it makes a carbon tax that much more effective.

Carbon taxes can only lower emissions if they raise the price of polluting relative to an alternative. If that alternative isn't available, then they risk being simply another source of revenue for the state.

Wind turbines being prepared. Photograph: Getty Images

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

Photo: Getty
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Jeremy Corbyn sat down on train he claimed was full, Virgin says

The train company has pushed back against a viral video starring the Labour leader, in which he sat on the floor.

Seats were available on the train where Jeremy Corbyn was filmed sitting on the floor, Virgin Trains has said.

On 16 August, a freelance film-maker who has been following the Labour leader released a video which showed Corbyn talking about the problems of overcrowded trains.

“This is a problem that many passengers face every day, commuters and long-distance travellers. Today this train is completely ram-packed,” he said. Is it fair that I should upgrade my ticket whilst others who might not be able to afford such a luxury should have to sit on the floor? It’s their money I would be spending after all.”

Commentators quickly pointed out that he would not have been able to claim for a first-class upgrade, as expenses rules only permit standard-class travel. Also, campaign expenses cannot be claimed back from the taxpayer. 

Today, Virgin Trains released footage of the Labour leader walking past empty unreserved seats to film his video, which took half an hour, before walking back to take another unreserved seat.

"CCTV footage taken from the train on August 11 shows Mr Corbyn and his team walked past empty, unreserved seats in coach H before walking through the rest of the train to the far end, where his team sat on the floor and started filming.

"The same footage then shows Mr Corbyn returning to coach H and taking a seat there, with the help of the onboard crew, around 45 minutes into the journey and over two hours before the train reached Newcastle.

"Mr Corbyn’s team carried out their filming around 30 minutes into the journey. There were also additional empty seats on the train (the 11am departure from King’s Cross) which appear from CCTV to have been reserved but not taken, so they were also available for other passengers to sit on."

A Virgin spokesperson commented: “We have to take issue with the idea that Mr Corbyn wasn’t able to be seated on the service, as this clearly wasn’t the case.

A spokesman for the Corbyn campaign told BuzzFeed News that the footage was a “lie”, and that Corbyn had given up his seat for a woman to take his place, and that “other people” had also sat in the aisles.

Owen Smith, Corbyn's leadership rival, tried a joke:

But a passenger on the train supported Corbyn's version of events.

Both Virgin Trains and the Corbyn campaign have been contacted for further comment.

UPDATE 17:07

A spokesperson for the Jeremy for Labour campaign commented:

“When Jeremy boarded the train he was unable to find unreserved seats, so he sat with other passengers in the corridor who were also unable to find a seat. 

"Later in the journey, seats became available after a family were upgraded to first class, and Jeremy and the team he was travelling with were offered the seats by a very helpful member of staff.

"Passengers across Britain will have been in similar situations on overcrowded, expensive trains. That is why our policy to bring the trains back into public ownership, as part of a plan to rebuild and transform Britain, is so popular with passengers and rail workers.”

A few testimonies from passengers who had their photos taken with Corbyn on the floor can be found here