Category: Climate science

Down by the seaside

This year’s NZ Climate Change Centre conference, to be held at Te Papa in Wellington next month, focusses on sea level rise, and how communities can adapt to the inevitable encroachment of the ocean. The organisers have laid on some excellent speakers, include Aussie oceanographer and sea level expert John Church, as well as many directly involved with the issues raised by sea level rise in New Zealand. The conference programme aims to:

  • Present the latest science of sea-level rise associated with climate change, including the role of polar ice-sheet melt
  • Present a synthesis of recent projections for sea-level rise and discuss the uncertainties associated with these projections
  • Identify anticipated impacts on New Zealand coastal environment and infrastructure resulting from climate change
  • Discuss whether adaptive risk management for adapting to sea-level rise will be adequate given the ranges projected and their uncertainties
  • Stimulate discussion of how end-users can manage present and future coastal issues and how social and bio-physical scientists, central and local government, and infrastructure operators can work together with communities to build resilient systems
  • Describe approaches that have been taken to planning coastal futures, which take into account community and resource-user needs underpinned by plausible climate change projections, adaptive approaches to manage uncertainties, and sound approaches to developing coastal policies.

Sounds like a very worthwhile couple of days. It’ll be interesting to hear what the “synthesis of recent projections for sea-level rise” suggests we’re in for, so if any HT readers are planning to attend, I’d be very happy to carry some conference reports.

For what it’s worth, in my view two numbers and one uncomfortable fact are of prime importance. We’re committed to warming, and therefore to sea level rise. The peak level of atmospheric CO2 that we reach (unless we can cut it very quickly after the peak by active carbon removal) will set the final quantum of sea level rise the planet will experience. The latest paleoclimate evidence suggests that current CO2 levels are putting us on course for an eventual 20 metres of sea level rise. Pick your final CO2 concentration, and calibrate against times past. At 300 ppm in the last interglacial, sea level was 6 metres higher than present.

The consequence of where we end up on the atmospheric carbon scale is a long term inevitable and uncomfortable commitment to continuously increasing sea level. It might be enough for some purposes to consider only a metre or two over the the next century, but if you’re planning to rebuild a city, perhaps you should look a little further ahead. Fascinating discussions are in store in Wellington, I confidently predict…

I was lucky enough to attend (and speak) at last year’s conference ((The proceedings of last year’s forum are now available from the NZ CCRI.)), and I’m sure that this year’s effort will be just as worthwhile.

[Zep]

Hansen’s righteous cause

The latest communication from James Hansen to his email list this week was a sharp reminder that the New Zealand Government’s commitment to the pursuit of unexploited fossil fuels is part of widespread malpractice.

The global stampede to find every possible fossil fuel is not being opposed by governments, no matter how dirty the fuels nor how senseless the energy strategy is from long-term economic and moral perspectives.

The specific case that Hansen focuses on is the Alberta tar sands. He has some chilling statistics.

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Asking the hard questions

I watched TVNZ’s Q+A on Sunday with dismay.  Phil Heatley, the Minister of Energy and Resources, was interviewed about the New Zealand government’s intention to increase oil, gas and coal exploration and mining. The emphasis of the interview was on the environmental issues, yet not a word was said about greenhouse gases or climate change. The environmental questions discussed were not unimportant, but they were easy for the Minister to swat away with talk of how Taranaki’s environment has not been seriously impacted by drilling, of how fracking is confined to suitable deep rock formations, of how careful the Government is to balance the interests of the environment against the economic gains to be had from the exploitation of our mineral resources, and so on.

What would the Minister have said if he was asked how the Government can justify pushing for increased fossil fuel exploitation in the light of the global warming to which the burning of these fuels will contribute?  I have a fair idea what he would have said, but he wasn’t asked. The fact that he wasn’t bothers me as much as his likely answer if he had been. Because it seems to indicate that the overwhelming question is either not perceived or deliberately avoided by journalists running a major current affairs programme.

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Cuckoo cocoon (Prat Watch #5.5)

Something stirred inside the carefully cultivated cocoon of ignorance at Richard Treadgold’s Climate “Conversation” blog, but I don’t think it was the butterfly of understanding preparing to inflate its wings. Something much more subterranean, I suspect. Needled by my post about said cocoon (namely, Treadgold’s insistence that “global warming has not happened for about 15 years, unless you take a micrometer to the thermometer“), RT issues a bold challenge: Well, where’s your evidence, Renowden?

He heads his post with a graph lifted from JunkScience (that well known purveyor of same), showing the HadCRUT3 monthly temperature series from 1978 to date. Amusingly, Treadgold makes an error before he even begins the meat of his diatribe. The caption he provides to the graph includes this:

The graph that proves no significant warming for about 15 years – since about 1996. Measured by satellite, not the unreliable hand of man.

The HadCRUT3 global series is most assuredly not a satellite generated temperature record. But we’ll let that pass, shall we, and take a quick canter through an answer to his challenge. I shall ignore Mark Twain’s advice just this once, in the hope that some light may shine in to the dark corners of his misunderstanding.

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Hansen’s letter on lignite

At the suggestion of Slovenian colleagues, James Hansen has written to the President and members of the National Assembly of the Republic of Slovenia urging them to deny a state guarantee for a proposed European Investment Bank loan to fund a new lignite-fired power plant in their country.

He points out that they are considering a decision which will have significant effects, some irreversible, upon the world that today’s young people and future generations inherit. Such a strong statement, he says, however unlikely it may seem at first glance, is a clear conclusion of the most advanced climate science. That science he proceeds to summarise in his letter, and to describe in more detail in an attached paper The Case for Avoiding Dangerous Climate Change to Protect Young People and Nature.

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