The price of tidal power

When did it become OK to save our wildlife at the expense of everyone else’s?

There’s no joy in it but it’s got to be done. We have to press ahead with harvesting the tidal energy of the River Severn, despite the havoc it is likely to wreak on local wildlife, because these days there is no such thing as local wildlife.

When we talk about living in a globalised world, we don’t usually think about nations sharing wildlife. But we are now getting other people’s fish. Bluefin tuna and anchovies are increasingly common in British waters and no doubt we’ll be getting into fights with foreign fishing fleets about them soon. Elsewhere, species of Japanese coral are migrating northwards. A few weeks ago, Australian scientists issued a report into the ocean biodiversity in their region. Rather shockingly, their tropical fish are moving away – those that aren’t dying off in the rapidly warming water are migrating southwards, following the plankton that are being carried on currents that are rising in strength.

You won’t be surprised to hear that the blame for all this flux lies with global warming. Rising temperatures leave the inhabitants of the ocean no choice but to embrace change. Paradoxically, though, taking measures to combat global warming – such as building the Severn barrage to reduce our dependence on fossil fuels – will also force changes on the natural world. It’s now a question of whether we value our creatures more than everyone else’s.

The Severn provides Britain with a golden opportunity to exploit lunar power. The moon’s pull causes earth’s water to bulge out from the surface and the geometry of the Severn creates a bigger bulge than most. The difference between its high and low tide is the second largest in the world; only Canada’s Bay of Fundy can beat the Severn’s 14-metre pile of water.

Hold that heap of water back until just the right moment and the resulting torrent on release is a renewable source of energy. A Severn barrage would provide enough lunar electricity to power 5 per cent of Britain’s homes, equivalent to three nuclear or gas-fuelled power stations. It would also last three times longer – at least. According to projections, the barrage could operate for over a century, compared to the few decades of lifetime offered by a nuclear plant.

A cross-party group of MPs is backing a campaign for the barrage to be built and David Cameron has recently instructed the Energy Secretary, Ed Davey, to look at the proposal. It still might not take off, however. That is because, from a local perspective, it will be an environmental tragedy.

As with any hydroelectric project, holding back the water floods areas that would usually be dry. In the case of the Severn barrage, many of those areas are mudflats designated as sites of special scientific interest: feeding grounds for important bird species. It’s also worth mentioning that forcing the water through electricity-generating turbines at high pressure cannot help but hurt fish populations, too.

No pain, no gain

The consortium looking to build the barrage has come up with a design that, it claims, reduces mudflat loss by 60 per cent and operates at lower pressures, easing the toll on the Severn’s fish. Perhaps there are other mitigation efforts that can be made, such as constructing artificial mudflats at the water’s new edge. Either way, it is hard to see how we can justify holding back the barrage now. We will have to sacrifice some of our cherished natural environment.

As far as carbon-free, sustainable energy generation goes, this is the low-hanging fruit. If we don’t grab it, our continued emissions will have a similar, maybe greater, impact on biodiversity in other places. Yes, it will hurt but when did it become OK to save our wildlife at the expense of everyone else’s?

 

Surfers ride the Severn Bore along the River Severn. Photograph: Getty Images

Michael Brooks holds a PhD in quantum physics. He writes a weekly science column for the New Statesman, and his most recent book is At the Edge of Uncertainty: 11 Discoveries Taking Science by Surprise.

Photo: Getty
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Theresa May's "clean Brexit" is hard Brexit with better PR

The Prime Minister's objectives point to the hardest of exits from the European Union. 

Theresa May will outline her approach to Britain’s Brexit deal in a much-hyped speech later today, with a 12-point plan for Brexit.

The headlines: her vow that Britain will not be “half in, half out” and border control will come before our membership of the single market.

And the PM will unveil a new flavour of Brexit: not hard, not soft, but “clean” aka hard but with better PR.

“Britain's clean break from EU” is the i’s splash, “My 12-point plan for Brexit” is the Telegraph’s, “We Will Get Clean Break From EU” cheers the Express, “Theresa’s New Free Britain” roars the Mail, “May: We’ll Go It Alone With CLEAN Brexit” is the Metro’s take. The Guardian goes for the somewhat more subdued “May rules out UK staying in single market” as their splash while the Sun opts for “Great Brexpectations”.

You might, at this point, be grappling with a sense of déjà vu. May’s new approach to the Brexit talks is pretty much what you’d expect from what she’s said since getting the keys to Downing Street, as I wrote back in October. Neither of her stated red lines, on border control or freeing British law from the European Court of Justice, can be met without taking Britain out of the single market aka a hard Brexit in old money.

What is new is the language on the customs union, the only area where May has actually been sparing on detail. The speech will make it clear that after Brexit, Britain will want to strike its own trade deals, which means that either an unlikely exemption will be carved out, or, more likely, that the United Kingdom will be out of the European Union, the single market and the customs union.

(As an aside, another good steer about the customs union can be found in today’s row between Boris Johnson and the other foreign ministers of the EU27. He is under fire for vetoing an EU statement in support of a two-state solution, reputedly to curry favour with Donald Trump. It would be strange if Downing Street was shredding decades of British policy on the Middle East to appease the President-Elect if we weren’t going to leave the customs union in order at the end of it.)

But what really matters isn’t what May says today but what happens around Europe over the next few months. Donald Trump’s attacks on the EU and Nato yesterday will increase the incentive on the part of the EU27 to put securing the political project front-and-centre in the Brexit talks, making a good deal for Britain significantly less likely.

Add that to the unforced errors on the part of the British government, like Amber Rudd’s wheeze to compile lists of foreign workers, and the diplomatic situation is not what you would wish to secure the best Brexit deal, to put it mildly.

Clean Brexit? Nah. It’s going to get messy. 

Stephen Bush is special correspondent at the New Statesman. His daily briefing, Morning Call, provides a quick and essential guide to British politics.