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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BHS is Theresa May’s big chance to reform capitalism – she’d better take it

Almost everyone is disgusted by the tale of BHS. 

Back in 2013, Theresa May gave a speech that might yet prove significant. In it, she declared: “Believing in free markets doesn’t mean we believe that anything goes.”

Capitalism wasn’t perfect, she continued: 

“Where it’s manifestly failing, where it’s losing public support, where it’s not helping to provide opportunity for all, we have to reform it.”

Three years on and just days into her premiership, May has the chance to be a reformist, thanks to one hell of an example of failing capitalism – BHS. 

The report from the Work and Pensions select committee was damning. Philip Green, the business tycoon, bought BHS and took more out than he put in. In a difficult environment, and without new investment, it began to bleed money. Green’s prize became a liability, and by 2014 he was desperate to get rid of it. He found a willing buyer, Paul Sutton, but the buyer had previously been convicted of fraud. So he sold it to Sutton’s former driver instead, for a quid. Yes, you read that right. He sold it to a crook’s driver for a quid.

This might all sound like a ludicrous but entertaining deal, if it wasn’t for the thousands of hapless BHS workers involved. One year later, the business collapsed, along with their job prospects. Not only that, but Green’s lack of attention to the pension fund meant their dreams of a comfortable retirement were now in jeopardy. 

The report called BHS “the unacceptable face of capitalism”. It concluded: 

"The truth is that a large proportion of those who have got rich or richer off the back of BHS are to blame. Sir Philip Green, Dominic Chappell and their respective directors, advisers and hangers-on are all culpable. 

“The tragedy is that those who have lost out are the ordinary employees and pensioners.”

May appears to agree. Her spokeswoman told journalists the PM would “look carefully” at policies to tackle “corporate irresponsibility”. 

She should take the opportunity.

Attempts to reshape capitalism are almost always blunted in practice. Corporations can make threats of their own. Think of Google’s sweetheart tax deals, banks’ excessive pay. Each time politicians tried to clamp down, there were threats of moving overseas. If the economy weakens in response to Brexit, the power to call the shots should tip more towards these companies. 

But this time, there will be few defenders of the BHS approach.

Firstly, the report's revelations about corporate governance damage many well-known brands, which are tarnished by association. Financial services firms will be just as keen as the public to avoid another BHS. Simon Walker, director general of the Institute of Directors, said that the circumstances of the collapse of BHS were “a blight on the reputation of British business”.

Secondly, the pensions issue will not go away. Neglected by Green until it was too late, the £571m hole in the BHS pension finances is extreme. But Tom McPhail from pensions firm Hargreaves Lansdown has warned there are thousands of other defined benefit schemes struggling with deficits. In the light of BHS, May has an opportunity to take an otherwise dusty issue – protections for workplace pensions - and place it top of the agenda. 

Thirdly, the BHS scandal is wreathed in the kind of opaque company structures loathed by voters on the left and right alike. The report found the Green family used private, offshore companies to direct the flow of money away from BHS, which made it in turn hard to investigate. The report stated: “These arrangements were designed to reduce tax bills. They have also had the effect of reducing levels of corporate transparency.”

BHS may have failed as a company, but its demise has succeeded in uniting the left and right. Trade unionists want more protection for workers; City boys are worried about their reputation; patriots mourn the death of a proud British company. May has a mandate to clean up capitalism - she should seize it.