Climate Change

Lord Rees of Ludlow Excerpts

Thursday 24th January 2019 Lords Chamber

[Lord Rees of Ludlow (CB)]

My Lords, climate science is intricate, but despite the uncertainties it offers two messages that most agree on. First, even within the next decade or two, regional disruptions to weather patterns and more extreme weather will aggravate pressures on food and water and enhance migration pressure. Secondly, under a global “business as usual” scenario we cannot rule out, later in the century, really catastrophic warming and tipping points triggering long-term trends like the melting of Greenland’s icecap, rendering some regions uninhabitable. There are diverse views on the policy response to these messages. Some economists apply a “standard” discount rate and in effect write off what happens after 2050. They therefore assign lower priority to combating climate change than to shorter-term ways of helping the world’s poor. But others argue that standard discounting is inappropriate here and that we should pay an “insurance premium” now to protect future generations against the worst-case scenarios.

As a parenthesis, I would note that there is one policy context where an essentially zero discount rate is applied, and that is to radioactive waste disposal, for which the depositories are required to prevent leakage for 10,000 years. That is somewhat ironic, given that we cannot plan the rest of our energy policy even 30 years ahead. Consider this analogy. Let us suppose that astronomers had tracked an asteroid and calculated that it would hit the earth in 2100, 80 years from now—not with certainty but with, say, a 10% likelihood. Would we relax and say that it is a problem that can be set on one side for 50 years? People will then be richer and it may turn out that it is going to miss us anyway. I do not think we would. There would surely be a consensus that we should start straight away and find ways to deflect it or to mitigate its effects.

The pledges made at the Paris and Poland conferences are a positive step, but they are not enough , especially if there is an aim to limit the expected temperature rise to 1.5 degrees. The recent report of the Energy Transmissions Commission, co-chaired by Adair Turner, was bullish about achieving the requisite global transition to zero carbon within 40 years. An extra investment of $900 billion per annum would be needed globally. That is a stupendous figure but it is only 0.6% of world GDP over the next four decades. However, that is still of course a massive challenge. Politicians will not gain much resonance by advocating unwelcome lifestyle changes now when the benefits accrue mainly to distant parts of the world and are decades in the future.

Achieving the energy transition will require accelerated R&D into all forms of low-carbon energy generation and other technologies where parallel progress is crucial, especially storage—batteries, compressed air, pumped storage, flywheels, et cetera—sequestration and smart grids. This scenario offers a win-win option for the UK. Implementing our Climate Change Act is important, although it will cut global emissions by less than 2%. But we produce more than 10% of the world’s best scientific research, and we can strive for a global lead and aspire to make far more than a 2% difference to energy R&D.

Solar and wind are front-runners, but other methods have geographical niches. One of ours is tidal energy. Our topography induces especially large-amplitude tides on Britain’s west coast. We should therefore explore tidal barrages and lagoons. Because of intermittency in sun and wind, the long-term goal should be continental-scale DC grids carrying solar energy from Morocco and Spain to less sunny northern Europe and east-west to smooth peak demand over different time zones—perhaps all the way along the belt and road to China.

It is surely worth while for the UK, given its traditional expertise in nuclear energy, to explore a variety of fourth-generation concepts, which could prove cheaper, more standardised and safer than existing nuclear designs. The faster these clean technologies advance, the sooner their prices will fall so that they become affordable to, for instance, India, where the health of the poor is now jeopardised by smoky stoves burning wood and dung, and where there would otherwise be pressure to build coal-fired power stations. It would be hard to imagine a more inspiring goal for our young engineers than to spearhead improved clean and affordable energy.

How can the long-term global goal of a low-carbon world get sustained political traction? How can it compete for political attention with urgent local issues? It can happen, just as other social attitudes have been changed in the past, if individuals with mega-influence can mould public opinion. I have two examples. The papal encyclical Laudato si’ had huge impact, eased the path to consensus at the Paris climate conference in 2015 and gained the Pope a standing ovation at the UN. This week our great secular guru, David Attenborough, has espoused the climate cause at Davos.

The young are far more activist, unsurprisingly, as they can hope to live to the end of the century. Their campaigning is welcome. Their commitment gives ground for hope. To give a parochial instance, I was especially pleased when some of our Cambridge students took an initiative that led to setting up the APPG for Future Generations. Today’s actions—or inactions—on environment and energy will resonate centuries ahead. They will determine the fate of the entire biosphere and how future generations live. We in this country can genuinely take a lead.