Very interesting talk. His connecting of things such as our value system with external systems was interesting not to mention the overall view of the global food system which is about to become a disaster it seems.
Some things though I wasn't so sure about. He seemed to underplay the importance of population growth citing a study that predicts population would continue to grow until the end of the century at about 11 billion before naturally declining and he cites another that organic small scale agriculture could sustain this and produce more than the industrial agriculture. This seems to conflict with his views on climate change where he rightly says that climate shocks will get more severe and affect food production. It seems all very well working out the theoretical maximum population the earth can support under a static unchanging model. But the reality is likely to be big losses to agriculture through unpredictable climate events (floods, draughts etc). This already happening in this country. Farmer's have said continually wet weather for the past, erm, about 5 years have significantly reduced yields in some areas.
Also didn't touch on ecology or mass extinction. Traditionally seafood has been a substantial source of food for many people around the world and yet now we see life in the oceans is declining steeply. Ninety percent of large fish are now gone and
a new report just out said zooplankton numbers have decreased by 73% since 1960, 50% since 1990!
Given that food production is, at best, likely to become more uncertain in the future it would seem clear that we should attempt to reduce our numbers asap to take account of these changes.
He also stated it took about 1000 calories of energy to produce 1 calorie of food which seemed very different from the more often quoted 10. I have seen some quotes suggesting more like 40 calories energy per unit of food for some more advanced countries.
Interesting was the claim that the Tar Sands use more energy than they produce which I hadn't heard before. The
EROEI (energy return on energy invested) oft quoted is more like 5 to 1 or even 1.5 (two barrels of oil equivalent energy to get out 3 barrels). However just found
an oil drum article suggesting possible negative EROEI:
What's worse, depending on a host of factors, the total Energy Return On Investment (the energy profit, if you will) for tar sands production is typically only around 5% to 10%. In fact, it has even been suggested that the EROI is negative in some cases. But with the current circumstances of stranded and otherwise useless natural gas, oil over $60, an extremely tight global oil supply situation, and a host of complicating factors like tax relief (which we'll get to in a moment), it still makes economic sense, if no other kind.
Another
interesting article on tar sands ERORI.
Anyway well worth listening to nevertheless and it would be good if he comes to Sheffield.