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Contents contributed and discussions participated by Peter Johnson

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Ch 18 Page 108: Sustainable Energy - without the hot air - 0 views

www.inference.phy.cam.ac.uk/...page_108.shtml

shared by Peter Johnson on 30 Mar 09 - Snapshot

I am partly driven to this conclusion by

the chorus of opposition that greets any major renewable energy proposal.

People love renewable energy, unless it is bigger than a figleaf.
- Peter Johnson on 30 Mar 09
  
  This is key: how to balance local and national interest. Which one trumps and after what process? The populist urge is to give in to local objections. It's also partly about just getting used to things.
  
  <div class="cArrow"> </div><div class="cContentInner">This is key: how to balance local and national interest. Which one trumps and after what process? The populist urge is to give in to local objections. It's also partly about just getting used to things.</div>
  
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Ch 15 Page 92: Sustainable Energy - without the hot air - 0 views

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shared by Peter Johnson on 08 Mar 09 - Snapshot

Ch 15 Page 91: Sustainable Energy - without the hot air - 0 views

www.inference.phy.cam.ac.uk/...page_91.shtml

shared by Peter Johnson on 13 Mar 09 - Snapshot

Ch 15 Page 90: Sustainable Energy - without the hot air - 0 views

www.inference.phy.cam.ac.uk/...page_90.shtml

shared by Peter Johnson on 08 Mar 09 - Snapshot

A new car’s embodied energy is 76 000 kWh – so if

you get one every 15 years, that’s an average energy cost of 14 kWh per day.

A life-cycle analysis by Treloar, Love, and Crawford estimates that building

an Australian road costs 7600 kWh per metre (a continuously reinforced

concrete road), and that, including maintenance costs, the total cost over

40 years was 35 000 kWh per metre.
- Peter Johnson on 13 Mar 09
  
  Can we scale this for trains? 400x bigger vehicles / 2x usable life / total numbers deployed (or required?) vs 33 million cars. And the rail network... Did I miss a discussion of train production and infrastructure elsewhere?
  
  <div class="cArrow"> </div><div class="cContentInner">Can we scale this for trains? 400x bigger vehicles / 2x usable life / total numbers deployed (or required?) vs 33 million cars. And the rail network... Did I miss a discussion of train production and infrastructure elsewhere?</div>
  
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Ch 13 Page 79: Sustainable Energy - without the hot air - 0 views

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shared by Peter Johnson on 13 Mar 09 - Snapshot

Shadowfax the horse weighs about 400 kg and consumes 17 kWh per

day.
- Peter Johnson on 13 Mar 09
  
  Which if you use Shadowfax to get to work is still less than the car... and unlike a bicycle, you can eat him too!
  
  <div class="cArrow"> </div><div class="cContentInner">Which if you use Shadowfax to get to work is still less than the car... and unlike a bicycle, you can eat him too!</div>
  
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Ch 14 Page 87: Sustainable Energy - without the hot air - 0 views

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shared by Peter Johnson on 11 Mar 09 - Snapshot

Many tidal energy extraction systems are just extracting energy that would

have been lost anyway in friction.
- Peter Johnson on 11 Mar 09
  
  But what's the consequence of harvesting A LOT of tidal energy, aside from the Earth's rotation slowing down at a slightly higher rate. Smaller tides?
  
  <div class="cArrow"> </div><div class="cContentInner">But what's the consequence of harvesting A LOT of tidal energy, aside from the Earth's rotation slowing down at a slightly higher rate. Smaller tides?</div>
  
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over 30 years.
- Peter Johnson on 11 Mar 09
  
  Great case for the longevity of the technology.
  
  <div class="cArrow"> </div><div class="cContentInner">Great case for the longevity of the technology.</div>
  
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Ch 14 Page 86: Sustainable Energy - without the hot air - 0 views

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shared by Peter Johnson on 11 Mar 09 - Snapshot

It doesn’t require

high-cost hardware, in contrast to solar photovoltaic power.
- Peter Johnson on 11 Mar 09
  
  A low-tech, non-experimental system that can be rolled (or floated) out progressively - and produces the goods - looks very attractive.
  
  <div class="cArrow"> </div><div class="cContentInner">A low-tech, non-experimental system that can be rolled (or floated) out progressively - and produces the goods - looks very attractive.</div>
  
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Ch 13 Page 78: Sustainable Energy - without the hot air - 0 views

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shared by Peter Johnson on 02 Mar 09 - Snapshot

Similar arguments can be made in favour of

carnivory for places such as the scrublands of Africa and the grasslands of

Australia
- Peter Johnson on 02 Mar 09
  
  -- and presumably game generally and wild fish. One could also add pests to the list: squirrels, Canada geese (rather tasty, I believe), feral pigeons. Could the nation's meat demands be met from animals that are not farmed or only farmed on self-sustaining land? Probably not.
  
  <div class="cArrow"> </div><div class="cContentInner">-- and presumably game generally and wild fish. One could also add pests to the list: squirrels, Canada geese (rather tasty, I believe), feral pigeons. Could the nation's meat demands be met from animals that are not farmed or only farmed on self-sustaining land? Probably not.</div>
  
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Ch 6 Page 41: Sustainable Energy - without the hot air - 0 views

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shared by Peter Johnson on 20 Feb 09 - Snapshot

paving 5% of the UK with solar panels seems beyond

the bounds of plausibility in so many way
- Peter Johnson on 20 Feb 09
  
  What efficiency level is needed to give worthwhile returns from an acceptable coverage of land? If the max plausible efficiency and land use don't stack up, we should forget it.
  
  <div class="cArrow"> </div><div class="cContentInner">What efficiency level is needed to give worthwhile returns from an acceptable coverage of land? If the max plausible efficiency and land use don't stack up, we should forget it.</div>
  
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Sustainable Energy - without the hot air: Ch 1 Page 14 - 0 views

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shared by Peter Johnson on 12 Jan 09 - Snapshot

The UK has made it onto the winners’ podium.

We may be only an average European country today, but in the table of

historical emitters, per capita, we are second only to the USA.
- Peter Johnson on 12 Jan 09
  
  Past polluting is a distraction: 125-year emissions estimates are debatable; the message is clear based on today's actual and forecast emissions; and it's hard to moralize about a time when nobody foresaw the consequences. Should we apologise to the world for Victorian factory smoke?
  
  <div class="cArrow"> </div><div class="cContentInner">Past polluting is a distraction: 125-year emissions estimates are debatable; the message is clear based on today's actual and forecast emissions; and it's hard to moralize about a time when nobody foresaw the consequences. Should we apologise to the world for Victorian factory smoke?</div>
  
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Peter Johnson