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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On the important issues, Louise Casey all too often has little to say

Far from moving the debate on, this new report on integration adds little to the report I commissioned in 2001. 

For 15 years, “numerous government reports on community cohesion and integration have not been implemented with enough force or consistency” concludes Louise Casey’s review of  integration.  The government’s lukewarm response suggests their effort will be as “diluted and muddled” as all the rest.

There’s a deeper reason why governments shy away from the measures that are needed. The report's wealth of data sets out a stark if sometimes contestable picture of a divided society.  But no amount of data can really bring the lives of our fellow citizens to life. As the Brexit vote underlined, this is now a nation divided by class, geography, education, wealth, opportunity and race. Those divisions colour the way we live our lives, the way we see problems in society, the relations we have with others, and our political choices. The report, like many before it, stops short of setting out that reality. It’s easier to pretend that most of us pretty much agree on most things; but just few people don’t agree and they must be the problem. Predictably, much of the early coverage has focussed on the Muslim community and new migrants. If only it were so easy.

According to Casey “in this country, we take poverty, social exclusion, social justice and social mobility seriously” and we do it “across political divides”. Apparently “creating a fair, just society where everyone can prosper and get on” is a cornerstone of British values. Yet for page after page the report chronicles the serial failure of this benign consensus to tackle educational under-performance, and economic and racial disadvantage. If we all agree, how come we haven't done anything about it?

These problems are not certainly easy to solve, but more lip service is paid to tackling them than effort. The practical material issues documented here need addressing, but punches are pulled when hard answers are needed. Given the dramatic impact of mass migration on cohesion, is integration possible while current rates of immigration persist? Can we find the political will to tackle poverty and disadvantage when those who might benefit from the effort are divided against each other by suspicion, race, geography and values? After all, rather than progressive policies producing a cohesive society, social unity is the precondition for the introduction of progressive policies.

We don't actually actually agree on what our “fundamental values” mean in practice. We can all sign up to democracy and the rule of law, but as soon as those are put into practice – see the court case on Article 50 – we are divided. When judges are popularly seen as “enemies of the people” and a vote in an elected parliament as a threat to democracy, in what sense are law and democracy fundamental?

Casey usefully highlights how treating homeless families equally, irrespective of ethnicity and length of residence can create the perception that minorities are being favoured over long standing residents. Our differing views on what is “just” and how “fairness” are defined can tear us apart. Is it fair to favour the newcomer over the indigenous? Is it just to put length of time on the waiting list above housing need? We often don't even acknowledge the legitimacy of other points of view, let alone try to find common ground.

The continual invocation of Britain and British values lends an air of unreality to the report.  Most people in England include British in their identity, but Englishness and English interests are of growing importance. In a worrying development, some areas of England  may be polarising between a white Englishness and an ethnic minority Britishness. Integration won't happen without a shared national story that combines a unifying national identity with the acceptance that we all have more than one identity that matters to us. Ignoring the reality of complex and multiple identities closes off one essential way forward.

None of this means that the criticism of some reactionary and occasionally dangerous ideas and practices in the Muslim community should be ignored and not confronted. But in a country where the established church opposes homosexual relationships and praise for Vladimir Putin's Russia is now mainstream politics it is hard to believe that all our problems can be reduced to the behaviour of a minority of a minority community.

John Denham was a Labour MP from 1992 to 2015, and a Secretary of State 2007 to 2010. He is Director of the Centre for English Identity and Politics at Winchester University