This is the five minute condensed version of the talk I gave in Gore at the Coal Action Network Aotearoa Summerfest (a somewhat optimistic title, given the chilly and wet weather last weekend).
It’s too late to avoid damaging climate change, because it’s already happening. Weather extremes — floods, droughts, heatwaves, wildfires, and storms — are on the increase, dramatic melting of Arctic sea ice is affecting northern hemisphere weather patterns, and accelerating ice loss in Greenland and Antarctica points towards a rapid increase in sea level. And the climate commitment, the 30 years it will take the planet to get back into energy balance once atmospheric CO2 is stabilised, guarantees that we will see much worse long before we see any benefit from action we take today.
Everything we do now to cut emissions will help us to avoid the very worst impacts — the almost unimaginable stuff that will be happening by the middle of this century — so it’s really worth doing.
To avoid future damage being catastrophic, we need emissions cuts to be made as if this were wartime. The global economy has to be switched from fossil fuel burning to clean energy as fast as possible — as if our very civilisation depended on it, because it does. Every year of delay now is a year more in the 2040s and 2050s of the very worst the climate system will throw at us. Every year of delay will make the job harder.
We need to go beyond stabilising atmospheric CO2 levels, and remove much of carbon emitted since the industrial revolution if we are to avoid losing much of the low lying land to long term sea level rise.
We need to be working now to futureproof New Zealand (and everywhere else) as much as possible. We must not lock our economies into high emissions pathways by investing in fossil fuel extraction or emissions-intensive agriculture. We must put in place policies to deal with sea level rise as it happens, but they will have to focus on managed retreat — at least until atmospheric CO2 is on a downwards trend. We need to focus on developing economic and social resilience, to enable us to recover from the inevitable shocks caused by rapid climate change.
This has to be the reality that our governments confront. Getting them to face up to the full seriousness of climate change is not going to be easy, but it’s going to have to be done.
I often find that preparing a talk crystallises my thinking around an issue, and that was certainly the case here. Reviewing the climate events of the last year, looking forward to the near future, and considering our options as climate change begins to really bite left me feeling rather gloomy — but the energy and enthusiasm of the CANA crowd, committed to preventing lignite mining in Southland and to phasing out coal mining throughout New Zealand, did a lot to put a smile back on my face.
Below the fold is an expanded version of the notes I prepared for my talk, with links to supporting material (as I promised to the audiences in Gore)…
Where we are now
Every year since 1976 has been above 20th century average [NOAA National Climate Data Centre]
2012 9th/10th warmest year (see link above)
- Warmest La Niña year
- 9 out 10 warmest years this century
- UKMO forecast new record in 2013 [Hot Topic]
Arctic sea ice rapid decline continues — new record minimum [National Snow and Ice Data Centre]
Greenland ice sheet record melt [Arctic Report Card]
NH weird weather linked to Arctic ice decline: In this section I described how the summer sea ice decline leads to a warm Arctic ocean in autumn and early winter, and the effect this has on jetstream behaviour (with much waving of arms). [Good overview at Climate Central]
Extreme weather is where climate bites
- Aussie heatwave + fires
- US warmest ever year
- US drought
- Floods & intense rainfall: – Pakistan, Nigeria, England’s wettest year
- The new normal
CO2 = 394 ppm – emissions still growing 2.5ppm per year [CO2Now]
Weak emissions policies: In this section, I described how the persistent framing of environmental protection as having to be balanced against economic activity, coupled with industry lobbying to reduce environmental protections and limit the costs of action to reduce emissions combine to create a lack of political will to address climate change. As a result national and international policies have been weakened or left becalmed.
Where we are heading
Sea level likely to rise 24 metres if atmospheric COs stabilises at 400 – 450 ppm [Science Daily]: the only question is how long it will take.
- News gets worse, not better
- Arctic seabed methane
- West Antarctica melt: rapid SLR a possibility [See last part of this Richard Alley lecture]
- Climate “flips”: Younger Dryas
Damaging climate change is unavoidable: climate commitment – 30 years warming in the pipeline
We have to cut net emissions to zero, then we have to take carbon out of the atmosphere
- 350.org (but 300 would be better)
- Oceans will work against us
- Technology not ready (yet)
Need “wartime” emissions cuts
- The longer you leave it, the harder it gets to cut
- The longer you leave it, the worse the unavoidable damage
- Geoengineering seems almost inevitable
- Coastal retreat – Christchurch!
- Do not lock economy into high emissions
- Coal, lignite
- Emissions intensive agriculture (dairy)
Coal deposits are not assets, they’re liabilities!