The Lib Dems are now in danger of excessive optimism

Even on a generous reading, the party is still on course to lose nearly half of its 57 seats.

They're trailing UKIP in the polls and rarely score above 10 points. They've lost a third of their members since 2010 (down from 65,038 to 42,501) and more than a thousand of their hard-won councillors. They ran a deficit of £410,951 last year and are struggling to raise the funds required to fight an adequate general election campaign. So why, ahead of the opening of their conference in Glasgow tomorrow, are the Lib Dems so cheerful?

The first reason is that the next election appears increasingly likely to result in another hung parliament. While the party could yet face a wounding left-right split if forced to choose between the Tories and Labour (both of whom could conceivably win enough seats to form a majority government with Lib Dem support), the thought of again holding the balance of power and negotiating concessions (proportional representation for local government!) is an intoxicating one.

The second is that the party believes both that a significant number of its 2010 supporters will return to the fold before 2015 and that it is performing better than the headline figures suggest. Were the results of the latest YouGov poll (which has them on 8 per cent) replicated on a uniform swing, the Lib Dems would retain just 17 of their 57 seats. But as the party's activists rejoice in pointing out, their vote is holding up, and even improving, in their heartlands. The Eastleigh by-election, which the party won comfortably in the most adverse circumstances (recall the misdemeanours of the two Chris's: Huhne and Rennard), is offered as ultimate proof that they are not heading for electoral apocalypse. Where the party is well organised and where it can appeal for tactical votes from Labour supporters (the Tories are in second place in 37 of the 57 Lib Dem seats), it can still win. It is this faith that explains why those calling for Nick Clegg's head are still limited to maverick non-MPs such as Lembit Opik and Lord Oakeshott. 

But if they were once suffering from an excess of pessimism, many Lib Dems now appear overly optimistic. Even if their vote share rises to 15% before 2015, the laws of arithmetic mean they cannot expect to win many more than 30 seats. The party's intention to fight the next election as "57 Eastleighs" ignores the fact that this simply isn't possible. While the Lib Dems were able to pour thousands of activists and cabinet ministers into the constituency, they won't be able to do so when fighting on 56 other fronts at the same time. After decades of advancement, the party is still on course for its worst performance since 1992, losing around half of its seats. If it isn't dreading the evening of 7 May 2015, it really should be. 

Nick Clegg leaves Number 10 Downing Street to attend Prime Minister's Questions. Photograph: Getty Images.

George Eaton is political editor of the New Statesman.

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Boris Johnson isn't risking his political life over Heathrow

The anti-Heathrow campaigner was never a committed environmentalist. 

A government announcement on expanding London’s airports is expected today, and while opposition forces have been rallying against the expected outcome - a third runway at Heathrow - the decision could also be a divisive one for the ruling Conservative party. A long consultation period will allow these divisions to fester. 

Reports suggest that up to 60 Conservative MPs are against expansion at the Heathrow site. The Prime Minister’s own constituents are threatening legal action, and the former London mayoral candidate, Zac Goldsmith, has promised to step down as MP for Richmond rather than let the airport develop.

But what of Boris Johnson? The politician long synonymous with Heathrow opposition - including a threat to lie down “in front of those bulldozers” - is expected to call the decision a mistake. But for a man unafraid to dangle from a zipwire, he has become unusually reticent on the subject.

The reticence has partly been imposed upon him. In a letter to her cabinet ministers, Theresa May has granted them freedom from the usual rules of collective responsibility (under which cabinet ministers are required to support government positions). But she has also requested that they refrain from speaking out in the Commons, from “actively” campaigning against her position, and from calling “into question the decision making process itself”.  

Johnson is not about to start cheering for Heathrow. But unlike Goldsmith, he is no committed environmentalist - and he's certainly a committed politician.  

Boris’s objections to the expansion at Heathrow have all too often only extended as far as the lives of his London constituents. These local impacts are not to be belittled – in his role of mayor of London, he rightly pointed to the extreme health risks of increased noise and air pollution. And his charisma and profile have also boosted community campaigns around these issues. 

But when it comes to reducing emissions, Johnson is complacent. He may have come a long way since a 2013 Telegraph article in which he questioned whether global warming was real. Yet his plan to build an alternative “hub” airport in the Thames Estuary would have left the question of cutting UK aviation emissions worryingly un-resolved. This lack of curiosity is alarming considering his current job as foreign secretary. 

And there are reasons to be concerned. According to Cait Hewitt at the Aviation Environment Federation, the UK fails to meet its targets for CO2 reduction. And the recent UN deal on aviation emission mitigation doesn’t even meet the commitments of the UK’s own Climate Change Act, let alone the more stringent demands of the Paris Agreement. “Deciding that we’re going to do something that we know is going to make a problem worse, before we’ve got an answer, is the wrong move”, said Hewitt.

There is a local environmental argument too. Donnachadh McCarthy, a spokesperson from the activist group “Rising Up”, says the pollution could affect Londoners' health: "With 70 per cent of flights taken just by 15 per cent of the UK's population... this is just not acceptable in a civilised democracy.”

The way Johnson tells it, his reason for staying in government is a pragmatic one. “I think I'd be better off staying in parliament to fight the case, frankly," he told LBC Radio in 2015. And he's right that, whatever the government’s position, the new “national policy statement” to authorise the project will likely face a year-long public consultation before a parliamentary vote in late 2017 or early 2018. Even then the application will still face a lengthy planning policy stage and possible judicial review. 

But if the foreign secretary does fight this quietly, in the back rooms of power, it is not just a loss to his constituents. It means the wider inconsistencies of his position can be brushed aside - rather than exposed and explored, and safely brought down to ground. 

India Bourke is an environment writer and editorial assistant at the New Statesman.