Wind farms and abuse of statistics: bird edition

When "wind farms are dangerous" really just means "there are a lot of birds".

When dealing with large numbers, it helps to have an idea of the expected order of magnitude. That way, you can know whether it is merely the number which is large, or the thing it's describing as well.

For instance, if I tell you of a country with 140,000 people in long-term unemployment, it's rather important for you to know if I'm talking about the US (population 280 million) or Luxembourg (population 525,000).

That's a test a Spectator article, Wind farms vs wildlife, failed quite badly this week.

The author, Clive Hambler, is a lecturer in biological and human sciences at Oxford university, and quotes a number of statistics to demonstrate how dangerous wind farms are to wildlife. For instance:

Every year in Spain alone — according to research by the conservation group SEO/Birdlife — between 6 and 18 million birds and bats are killed by wind farms. They kill roughly twice as many bats as birds. This breaks down as approximately 110–330 birds per turbine per year and 200–670 bats per year. And these figures may be conservative if you compare them to statistics published in December 2002 by the California Energy Commission: ‘In a summary of avian impacts at wind turbines by Benner et al (1993) bird deaths per turbine per year were as high as 309 in Germany and 895 in Sweden.’

Similar claims are made throughout. Apparently the annual death toll of bats in the US and Canada is "up to three million", "Norwegian wind farms kill over ten white-tailed eagles per year", and so on.

What is missing is any context through which we can examine these numbers. It might change our interpretation of the figures to know that:

Domestic and feral cats have also been considered a major source of anthropogenic-caused mortality with estimates near 100 million annual bird deaths [in the US].

Or that, on roads near wetlands in Canada:

223 birds were killed per mile per year.                                                                                            

Power lines in the US are estimated to kill:

…approximately 130 million birds per year.                                                                                                        

While we're banning things, we may want to keep an eye out for that scourge of the avian world, windows:

97.6 to 976 million bird deaths per year in the U.S. due to collisions with windows… based on an estimated 1 to 10 bird deaths per structure per year from a fatality study in New York.

All those figures come from a 2005 paper by the US Department of Agriculture.

In other words, even with the massive figures from Spain – figures which show deaths per turbine per year two orders of magnitude higher than equivalent figures cited in the above paper, which are based on an assumption that for every confirmed death, there's nineteen uncomfirmed, and which come from a set of guidelines which explicitly concludes wind farms are OK for birds if built correctly (pdf) –  wind farms kill fewer birds than cats, power lines, roads or windows. That comparison would have been rather useful to include in the original piece. With that in mind, the numbers in the piece become less a demonstration of the awesome mortality of wind farms, and more a confirmation that yes, there are a lot of birds in the world.

Update

It's been pointed out on Twitter that I'm not comparing like to like. Spain is smaller than the US, of course. Thankfully, the USDA also estimates the number of birds killed by wind farms in America: between 20,000 and 37,000 a year. I let you draw your own conclusions from the discrepancy.

Wind Turbines in Spain. Photograph: Wikimedia Commons

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

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Want to send a positive Brexit message to Europe? Back Arsene Wenger for England manager

Boris Johnson could make a gesture of goodwill. 

It is hard not to feel some sympathy for Sam Allardyce, who coveted the England job for so many years, before losing it after playing just a single match. Yet Allardyce has only himself to blame and the Football Association were right to move quickly to end his tenure.

There are many candidates for the job. The experience of Alan Pardew and the potential of Eddie Howe make them strong contenders. The FA's reported interest in Ralf Rangner sent most of us scurrying to Google to find out who the little known Leipzig manager is. But the standout contender is Arsenal's French boss Arsene Wenger, 

Would England fans accept a foreign manager? The experience of Sven Goran-Eriksson suggests so, especially when the results are good. Nobody complained about having a Swede in charge the night that England won 5-1 in Munich, though Sven's sides never won the glittering prizes, the Swede proving perhaps too rigidly English in his commitment to the 4-4-2 formation.

Fabio Capello's brief stint was less successful. He never seemed happy in the English game, preferring to give interviews in Italian. That perhaps contributed to his abrupt departure, falling out with his FA bosses after he seemed unable to understand why allegations of racial abuse by the England captain had to be taken seriously by the governing body.

Arsene Wenger could not be more different. Almost unknown when he arrived to "Arsene Who?" headlines two decades ago, he became as much part of North London folklore as all-time great Arsenal and Spurs bosses, Herbert Chapman or Bill Nicholson, his own Invicibles once dominating the premier league without losing a game all season. There has been more frustration since the move from Highbury to the Emirates, but Wenger's track record means he ranks among the greatest managers of the last hundred years - and he could surely do a job for England.

Arsene is a European Anglophile. While the media debate whether or not the FA Cup has lost its place in our hearts, Wenger has no doubt that its magic still matters, which may be why his Arsenal sides have kept on winning it so often. Wenger manages a multinational team but England's football traditions have certainly got under his skin. The Arsenal boss has changed his mind about emulating the continental innovation of a winter break. "I would cry if you changed that", he has said, citing his love of Boxing Day football as part of the popular tradition of English football.

Obviously, the FA must make this decision on football grounds. It is an important one to get right. Fifty years of hurt still haven't stopped us dreaming, but losing to Iceland this summer while watching Wales march to the semi-finals certainly tested any lingering optimism. Wenger was as gutted as anybody. "This is my second country. I was absolutely on my knees when we lost to Iceland. I couldn't believe it" he said.

The man to turn things around must clearly be chosen on merit. But I wonder if our new Foreign Secretary Boris Johnson - albeit more of a rugger man himself - might be tempted to quietly  suggest in the corridors of footballing power that the appointment could play an unlikely role in helping to get the mood music in place which would help to secure the best Brexit deal for Britain, and for Europe too.

Johnson does have one serious bit of unfinished business from the referendum campaign: to persuade his new boss Theresa May that the commitments made to European nationals in Britain must be honoured in full.  The government should speed up its response and put that guarantee in place. 

Nor should that commitment to 3m of our neighbours and friends be made grudgingly.

So Boris should also come out and back Arsene for the England job, as a very good symbolic way to show that we will continue to celebrate the Europeans here who contribute so much to our society.

British negotiators will be watching the twists and turns of the battle for the Elysee Palace, to see whether Alain Juppe, Nicolas Sarkozy end up as President. It is a reminder that other countries face domestic pressures over the negotiations to come too. So the political negotiations will be tough - but we should make sure our social and cultural relations with Europe remain warm.

More than half of Britons voted to leave the political structures of the European Union in June. Most voters on both sides of the referendum had little love of the Brussels institutions, or indeed any understanding of what they do.

But how can we ensure that our European neighbours and friends understand and hear that this was no rejection of them - and that so many of the ways that we engage with our fellow Europeans rom family ties to foreign holidays, the European contributions to making our society that bit better - the baguettes and cappuccinos, cultural links and sporting heroes remain as much loved as ever.

We will see that this weekend when nobody in the golf clubs will be asking who voted Remain and who voted Leave as we cheer on our European team - seven Brits playing in the twelve-strong side, alongside their Spanish, Belgian, German, Irish and Swedish team-mates.

And now another important opportunity to get that message across suddenly presents itself.

Wenger for England. What better post-Brexit commitment to a new Entente Cordiale could we possibly make?

Sunder Katwala is director of British Future and former general secretary of the Fabian Society.