What Japan nuclear crisis means for global warming

It can be difficult to keep a sense of perspective in the midst of a crisis. Yet this is what the Japanese earthquake, tsunami and resulting nuclear accidents demand. There is no doubt that the explosions and radioactive releases at the stricken Fukushima Daiichi plant represent the worst nuclear disaster since the explosion at the Chernobyl power plant in Ukraine in 1986. However, that does not mean the correct response is panic. At the time of writing, the most likely long-term outcome remains that neither the public nor the plant workers will die or be harmed from the doses of radiation that they have received.

Disaster at Fukushima

You could argue that, in the context of a tsunami that may have killed 10,000 people or more, the overwhelming media focus on the Fukushima crisis is disproportionate. But the Japanese government is in a no-win situation: if Prime Minister Naoto Kan tries to calm public fears, he will be accused of conspiring in a cover-up. However, by telling people to stay indoors, not to drink tap water and to evacuate from all areas within a 30-kilometre radius around the Fukushima plant, the government has risked triggering panic at a time when rescue teams are still uncovering survivors and when those who have lost their homes need to be cared for and fed.

It is far too early to make any meaningful assessment of the long-term effect of the nuclear accident. Explosions have destroyed the outer walls of two of the reactor buildings. Over in another building, a fire has been reported near a cooling pond that lost its water, while the containment vessel housing the reactor core of one of the units may have been damaged. The last two incidents seem to have released sufficient radioactive material to pose a potential health hazard for those close by. At the time of writing, the situation is not yet under control and may still deteriorate.

But even a total meltdown would be much less deadly than at Chernobyl, where the reactor was still operating when it blew up, spreading burning and radioactive debris and dust over wide areas. Moreover, Soviet-era design flaws in the Ukrainian reactor meant that it had a “positive void coefficient”: a loss of coolant would speed up the reaction and allow it to run out of control, which was what happened when the operators ran an ill-advised test on 26 April 1986.

If the crisis in Japan leads to a large-scale shift in attitudes against nuclear power, the outcome will be a worsening of human impact on the
environment. Japan is a good example of why fixing global warming without increased use of nuclear energy is as good as impossible: the country has little resources of solar or wind power, and is heavily dependent on imported fossil fuels. Coal and nuclear each meet about 25 per cent of Japanese energy needs.

Any running down of nuclear power over the short or medium term will lead to higher use of coal and gas, greater greenhouse emissions and an intensifying contribution to global warming. Increased renewables and efficiency could alter this trajectory by a few percentage points, but that is all. Japan is already trying to extricate itself from the Kyoto Treaty on climate change – without recourse to nuclear generation, it will struggle to meet the existing targets, let alone any new ones.

It is important to bear in mind that all energy sources carry risks. The BP disaster in the Gulf of Mexico last year killed 11 workers and polluted a large area of ocean and coast, yet the US government is leasing new areas for offshore drilling. Natural-gas infrastructure occasionally blows up, sometimes killing civilians (most recently in Italy in 2009, when a train carrying liquefied natural gas derailed and exploded), while thousands are killed each year in coal-mine disasters. Hydroelectric dams are also vulnerable to earthquakes and risk causing inland tsunamis if they burst. Even wind turbines may need to be surrounded by exclusion zones, because of the possibility of ice falling from their blades and other hazards.

Nuclear power has so far maintained an enviable safety record, even during accidents: Three Mile Island, in Pennsylvania, US, which resulted in a partial meltdown in 1979, released very little radiation and had no impact on the health of surrounding populations.

None of this should be misinterpreted as an argument for complacency in nuclear engineering. Newer reactor designs include even more passive safety elements, and no doubt grave lessons will be learned from the events in Japan. It is notable that the Fukushima plant, which is 40 years old, should have been shut down, but had its lifetime extended because of the demand for electricity.

Similar extensions to older reactors have been considered or granted in Germany, the UK and Sweden. Why policymakers, anti-nuclear campaigners and the general public prefer to keep older and less safe reactors open well past their design lifetime rather than allow the construction of new plants is a mystery.

The Japanese nuclear crisis comes at a time when many were beginning – in the light of climate change – to re-examine their opposition to civil nuclear power. Anti-nuclear campaigners may feel vindicated, but they should be careful what they wish for: if we abandon nuclear, prepare for a future of catastrophic global warming, imperilling the survival of civilisation and much of the earth’s biosphere.

First published in the New Statesman, on 17 March 2011


  1. Andy Railton


    I don’t know about the licensing process in Germany, Sweden or Japan, but UK reactors are required to undergo a major safety review every 10 years and this includes assessing the safety case for the reactor against the current safety standards and assessing the condition of the reactor to confirm it is acceptable. The review needs to demonstrate that the reactor will fullfil the requirements of the safety case for the next 10 years (including the condition of the reactors) and will almost always require enhancements to be made to the plant. A more useful question is whether the safety standards adequately address any new hazards, such as deliberately flying planes into plants, or new information such as how a reactor behaves in a fault situation or revised information about say seismic events in an area. This process of having an initial design life that can be extended applies to just about everything, so it can hardly be called contoversial.

  2. Tom Prescott

    Another great article Mark, its not that we’re pro-nuclear fanatics its just that there’s no alternative, its notable that the combined heat and power so loved by the old greens depends on fossil fuel.

  3. Robin Smith

    This statement may well be true, all other things being equal:

    “if we abandon nuclear, prepare for a future of catastrophic global warming, imperilling the survival of civilisation and much of the earth’s biosphere.”

    Yet it presumes society in general will continue to ignore the deeper problem, the bigger problem. Climate change in itself being merely an effect of that deeper problem. Every little counts… a little … again. Just like Professor Mackay keeps warning.

    Continuing on a pathway, where the worlds Primary Social Organisation limit’s innovation, compels enormous waste, feeds corruption, makes democracy a nominal tyranny and forces quasi slavery even on the western middle classes, climate change is just the latest inevitable form of destruction. An effect of this deeper cause. A symptom of that deeper social disease.

    Imagine a world powered completely by carbon free energy, which I already support fully as a member of EFN. What would be the effect? Production of wealth would grow even more. A great thing. But the wealth divide would also grow ever wider because all the gains would go, unearned, to the private owners of natural resources that are at the root of this primary social organisation. We would see more of the stupidity as a result, … all other things being equal.

    We might cure climate change. But the people would be ever the less humans, ever the more robots. Why not lets cure climate change AND free civilisation too as you allude to in your statement. Do you really trust your own words here because it does not sound like it?


Leave a Comment

Your email address will not be published. Required fields are marked *