I dare say that many of you are like me: aware of the fact that climate change is a major global threat, but nonetheless confused by the information overload.
Some of what we read is reasoned and logical; but much else is deliberately out to scare, obfuscate or misinform us. If someone is trying to sell you something, you have to be doubly careful[1]!
When it relates to the environment, we are constantly fed horror-stories, warnings and suggested actions. These often accompany technical words and phrases like ‘CO²’, ‘kWh’ and ‘% reduction’, which are linked to insane comparisons, such as “the waste alone would fill 200 Wembley Stadiums”!!
As an introduction to this field I have previously urged you to read the likes of Heat, The Hot Topic and The Revenge of Gaia. The one single book, however, that quite superbly lays out the key energy-related questions and answers is Dave Mackay’s Sustainable Energy Without the Hot Air (SEWTHA)[2].
His work ignores emotion and hyperbole (a fitting strap-line for The Sun!?) and concentrates on factual comparison and relevance.
I am going to highlight some of the key issues that have interested or puzzled me, though naturally I urge you to read the material yourself. The diagrams are fun and colourful, though small to save space; likewise my explanations if I think you are intelligent enough to get the point!
Some Basics (really quickly):
Life needs energy; energy has been predominantly produced through fossil fuels (carbon-based); using these causes CO² emissions to rise; CO² is a greenhouse gas that traps heat.
Alongside the environmental factors, we also have major concerns about the shortage and security of supply of fossil fuels.
SEWTHA makes it easy by just using kWh to express energy and kWh/day to express power. A 40W bulb, on permanently, uses one kWh/d. Power is the rate at which something uses energy.
“If you drive a 4×4, you are damaging the environment, increasing our dependence on foreign oil… and you look like a twat!” Marcus Brigstocke
Some Primary Questions
Is the Earth heating up?
Yes
Are humans causing this?
Scientists mostly agree that they are. This is as close to consensus as anything can ever be.
http://www.inference.phy.cam.ac.uk/withouthotair/c1/page_9.shtml
What is the principle cause?
See the table below. It’s the Energy Economy, stupid! The other factors are still HUGE, but energy trumps them all.
http://www.inference.phy.cam.ac.uk/withouthotair/c1/page_15.shtml
What do we each emit?
The world average is 5.5 tonnes of CO² and equivalent greenhouse gases (5.5t CO²e – hoo yeh!!). The US, Australia and Canada are up in the 20s; the UK is over 10.
http://www.inference.phy.cam.ac.uk/withouthotair/c1/page_14.shtml
What do we need to get to?
That’s currently a big debate (and will dominate the Copenhagen Talks this December), but the answer is sadly ‘lower than we think, or would be comfortable with’. We might need to be at 1t CO²e/person by 2050!
If energy is the big deal, how much of it do we consume?
Average UK and European power consumption: 125kWh/person/day (see below)
http://www.inference.phy.cam.ac.uk/withouthotair/c18/page_105.shtml
What will happen?
No-one knows for sure, but most probably a combination of ice caps melting, severe weather systems, ocean flow effects, flora and fauna extinction and much, much more. In short, it’s bad … and we can’t predict it!
How bad is China?
China is now emitting at about the same level as the US, but obviously has far lower emissions per capita. Further, much of their production (causing the emissions) is for rich countries. But yes, they are bad and are only going to get worse.
Why bother doing anything?
I won’t spend the time on morality here, so please read The Environment: Our State of Play, which I will publish shortly.
Some Cool Facts
Whilst I have made extensive notes on the whole book[3], I shall not bore you silly here.
Before the final answers are revealed though, I am including just a few of the best illustrations in the book. Don’t worry, there’s nothing technical here:
Gadgets: Just look at an un-used printer or computer box!
|
Gadget
|
Power consumption (W)
|
|
on and
active |
on but
inactive |
standby
|
off
|
|
Computer and peripherals:
|
|
|
|
|
|
computer box
|
80
|
55
|
|
2
|
|
cathode-ray display
|
110
|
|
3
|
0
|
|
LCD display
|
34
|
|
2
|
1
|
|
projector
|
150
|
|
5
|
|
|
laser printer
|
500
|
17
|
|
|
|
wireless & cable-modem
|
9
|
|
|
|
|
Laptop computer
|
16
|
9
|
|
0.5
|
|
Portable CD player
|
2
|
|
|
|
|
Bedside clock-radio
|
1.1
|
1
|
|
|
|
Bedside clock-radio
|
1.9
|
1.4
|
|
|
|
Digital radio
|
9.1
|
|
3
|
|
|
Radio cassette-player
|
3
|
1.2
|
|
1.2
|
|
Stereo amplifier
|
6
|
|
|
6
|
|
Stereo amplifier II
|
13
|
|
|
0
|
|
Home cinema sound
|
7
|
7
|
4
|
|
|
DVD player
|
7
|
6
|
|
|
|
DVD player II
|
12
|
10
|
5
|
|
|
TV
|
100
|
|
10
|
|
|
Video recorder
|
13
|
|
1
|
|
|
Digital TV set top box
|
6
|
|
5
|
|
|
Clock on microwave oven
|
2
|
|
|
|
|
Xbox
|
160
|
|
2.4
|
|
|
Sony Playstation 3
|
190
|
|
2
|
|
|
Nintendo Wii
|
18
|
|
2
|
|
|
Answering machine
|
|
2
|
|
|
|
Answering machine II
|
|
3
|
|
|
|
Cordless telephone
|
|
1.7
|
|
|
|
Mobile phone charger
|
5
|
0.5
|
|
|
|
Vacuum cleaner
|
1600
|
|
|
|
Stuff: What do we buy, where does it come from, what does it cost?
http://www.inference.phy.cam.ac.uk/withouthotair/cH/page_323.shtml
The Conclusions
This is where we are now and where we might be able to get to … all in pretty pictures for you. To find out how he discovered all of this, you’ll have to read it, as I’m getting tired!
http://www.inference.phy.cam.ac.uk/withouthotair/c27/page_204.shtml
After much discussion and analysis (which you have conveniently missed), Mackay comes up with his Five Energy Plans for the UK. We only need to pick one of them!
http://www.inference.phy.cam.ac.uk/withouthotair/c27/page_212.shtml
Here is how the UK might end up looking (and this isn’t even the renewables-heavy plan!):
http://www.inference.phy.cam.ac.uk/withouthotair/c27/page_215.shtml
And here is an astonishingly succinct breakdown of the available low carbon technologies (OK, now we are getting geeky!):
| Capacity |
Rough cost
total |
per person |
Average
power
delivered |
| 52 onshore wind farms: 5200 km2 |
35 GW |
£27bn |
£450 |
4.2 kWh/d/p |
| |
|
–based on Lewis wind farm |
|
| 29 offshore wind farms: 2900 km2 |
29 GW |
£36bn |
£650 |
3.5 kWh/d/p |
| |
|
– based on Kentish Flats, & including £3bn
investment in jack-up barges. |
|
Pumped storage:
15 facilities similar to Dinorwig |
30 GW |
£15bn |
£250 |
|
| Photovoltaic farms: 1000 km2 |
48 GW |
£190bn |
£3200 |
2 kWh/d/p |
| |
|
– based on Solarpark in Bavaria |
|
Solar hot water panels:
1 m2 of roof-mounted panel
per person. (60 km2 total) |
2.5 GW(th)
average |
£72bn |
£1200 |
1 kWh/d/p |
Waste incinerators:
100 new 30 MW incinerators |
3 GW |
£8.5bn |
£140 |
1.1 kWh/d/p |
| |
– based on SELCHP |
|
| Heat pumps |
210 GW(th) |
£60bn |
£1000 |
12 kWh/d/p |
Wave farms – 2500 Pelamis,
130 km of sea |
1.9 GW
(0.76 GW average) |
£6bn? |
£100 |
0.3 kWh/d/p |
| Severn barrage: 550 km2 |
8 GW (2 GW average) |
£15bn |
£250 |
0.8 kWh/d/p |
| Tidal lagoons: 800 km2 |
1.75 GW average |
£2.6bn? |
£45 |
0.7 kWh/d/p |
Tidal stream:
15 000 turbines – 2000 km2 |
18 GW
(5.5 GW average) |
£21bn? |
£350 |
2.2 kWh/d/p |
| Nuclear power: 40 stations |
45 GW |
£60bn |
£1000 |
16 kWh/d/p |
| |
|
– based on Olkiluoto, Finland |
|
| Clean coal |
8 GW |
£16bn |
£270 |
3 kWh/d/p |
Concentrating solar power
in deserts: 2700 km2 |
40 GW average |
£340bn |
£5700 |
16 kWh/d/p |
| |
– based on Solúcar |
|
Land in Europe for 1600 km of
HVDC power lines: 1200 km2 |
50 GW |
£1bn |
£15 |
|
| |
– assuming land costs £7500 per ha |
|
| 2000 km of HVDC power lines |
50 GW |
£1bn |
£15 |
|
| |
|
– based on German Aerospace Center estimates |
|
| Biofuels: 30 000 km2 |
|
(cost not estimated)
|
2 kWh/d/p |
| Wood/Miscanthus: 31 000 km2 |
|
(cost not estimated)
|
5 kWh/d/p |
The Summary Conclusion
The UK is 90% reliant on fossil fuels and therefore we will need big – no, immense – changes. That means alterations to transport, more efficient heating, increasing green energy production, etc.
Small actions will not make the difference we need!
Carbon pollution must be priced correctly and early stage green businesses must be incentivised and supported.
The book addresses:
Þ Nuclear: this should be seriously considered; a statement which other environmentalists now agree with
Þ Renewables: everyone loves them, but there is no numerical/financial evidence that they will produce enough power to meet our growing demand. We also can’t have all of them as they’ll get in each other’s way; not to mention the shocking planning constraints in this country
Þ Sahara Desert Solar and other foreign renewables: not ideal, but don’t dismiss it
Þ ‘Carbon Capture & Storage’: great potential; let’s see the proof
Þ Electric transport: will have a huge part to play (and car batteries may even be a way of storing power)
People, governments, local authorities, businesses … MUST start saying YES!
[1] Where do you think Marks and Spencer’s
Loch Muir salmon comes from? The answer is: anywhere; all over the place. It certainly isn’t Loch Muir, as no such loch exists. Name sounds good though …
[2] Dave Mackay has been kind enough to write this book for all of us, and not for money. As such, the material is free to use and can be read completely online (UIT Cambridge, 2008). By the way, he has now been recruited by Ed Miliband, Energy and Climate Change secretary, apparently to work on the government’s Low Carbon Transition Plan.
[3] … and thus have finally learnt my own power consumption. I’m very good by UK standards, but shocking compared to most of the world.
Posted in A New and Better World, Capitalism, Economics, Environment, Energy, The Planet, Health, Wellbeing, Sustainability