Being opposed to things can become very dull. People who are Greenish or Reddish or a mixture of the two always seem to be anti-this and against that, fighting this development or opposing that policy, and frankly I've had enough. I want to be on board. I want to be on the team. I want to start saying Yes.
So how about the Severn Barrage? What's that? I hear you say. The Severn Barrage is basically a dam, which will stretch across the mouth of the river Severn between the Welsh city of Cardiff and the English coast about ten miles away. This particular stretch of the British coast has a huge tidal range (at most about 15m or, whatever it is, 45 feet between high and low tides), which means that hydroelectric turbines set into the dam will be able to generate 5% of the UK's electricity.
That sounds like a lot, doesn't it? In fact the whole idea sounds fabulously Green and lovely. I want to be a supporter. I really really want to say Yes to the Severn Barrage.
But I can't. I have to say, once again, NO! NO! NO! NO! NO! NO! NO! NO! NO! NO! NO! NO! NO! That's Nein, Non, er Nul Point.
It's a terrible idea. A monstrously Groanish, ghastly and despicable idea. Why? Oh dear, I'll have to add a (Not) to the title. I meant to have five Pros, but it looks like a fistful of Cons instead:
1. The people who want to build the Barrage aren't in it for the Green power. They're in it for the development potential upstream. With the tidal flow reduced the river will flood less and the water will be clearer, making it more conducive to watersports and luxury waterside apartment blocks. The Severn has never been a river that likes to stay within its banks - the Barrage will finally tame it.
2. At the moment the Severn Estuary is one of the world's most important stopover points for migratory wetland birds. At Slimbridge, a ways upriver from the proposed Barrage, the Wildfowl and Wetlands Trust is like a motel and gas station for tired geese. Any reduciton in the river's tidal flow will have an impact on the birds, but no one knows exactly what it will be.
3. Migratory fish species are already declining around the rivers of Europe. The salmon and the eel were once both plentiful in the Severn, and their decline is at least partially because of ever more efficient flood defences. Weirs block the main stream and floodgates prevent water flowing from the main river into its tributaries. Since few people now make a living from the fishery there are few who care whether fish live or die. A barrage, even if navigable by fish, can only make the situation worse.
4. The Severn Bore is one of Britain's natural wonders. Formed by the incoming tide as it piles into the funnel-shaped estuary, the Bore is a wave up to six feet high, which travels miles upriver. Surfers travel from all over the world to ride on this most determined of rollers, and at present the unofficial world record for the longest single ride on a surfboard is held by a veteran Severn surfer Steve King. The barrage would of course kill the Bore.
5. There are alternatives. One is to build lagoons which will trap water as it flows out with the tide and use it to power turbines. These wouldn't block the river, which is good news for the river. However, this means developers or investors won't have the incentives outlined in (1) above, so it ain't likely to happen. Another option is to invest more money in developing free-standing tidal turbines - like wind turbines underwater. These have been developed on a shoestring (no, not literally) by some of the UK's amazing renewable energy boffins, and a couple of models are being tested right now. Will the inventors find UK investors? Or will they sell their fantastic ideas abroad, while we continue turning our beautiful island into a giant waterside housing development in which rivers are lifeless pools and wildlife clings for dear life to the tiny patches of SLOAP (Space Left Over After Planning)?
Nature is soft, not hard. Rivers like the Severn are supposed to change with the tides and seasons. The regular flooding has given the Severn vale the rich agricultural land farmers have valued for centuries, but now we are only interested in bricks and mortar - which are hard and don't respond well to immersion in brackish water. We've tunnelled and bridged the Severn. Now the engineers want to finish the job and dam it.
Time to bring back the Monkey Wrench Gang.
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