7. How long does it take to earn
an hour of reading light?
Tallow candle
1800 – 6 hrs
Kerosene lamp
1880 – 15 mins
Incandescent bulb
1950 – 8 secs
CF bulb
1997 – ½ sec
Labour cost of 1,200 lumen
hours at average US wage
Nordhaus 1997: http://www.nber.org/chapters/c6064.pdf
8. But are we healthier,
happier, safer, better
fed, cleverer, cleaner, kinder, freer
, more peaceful, more equal?
22. ``No man ever saw a dog
make fair and deliberate
exchange of a bone with
another dog’’
Adam Smith 1776
23. Comparative advantage
David Ricardo
1817
Adam takes 4 hours to make a spear and
3 hours to make an axe
Oz takes 1 hour to make a spear and 2
hours to make an axe
If Oz makes 2 spears
And Adam makes 2 axes
And they trade…
Then they each save an hour of work
33. Art Fry, inventor of the
Post-it note at 3M
“Innovation is a
numbers game. You
have to go through
5,000 to 6,000 raw
ideas to find one
successful business.”
Trial and error
51. ``We cannot absolutely prove that those
are in error who say society has reached
a turning point, that we have seen our
best days, but so said all who came
before us and with just as much
apparent reason...On what principle is it
that with nothing but improvement
behind us we are to expect nothing but
deterioration before us?’’
Thomas Babington Macaulay, 1830
54. We’re using less land to produce
more food
After 50 years the world uses 65% less land
to produce the same amount of food
“Peak Farmland and the Prospect for Land Sparing”
Jesse H. Ausubel, Iddo K. WernIck, Paul E. Waggoner
59. 59
http://onlinelibrary.wiley.com/doi/10.1002/grl.50563/abstract
“Our work was able to tease-out the CO2 fertilization effect by using
mathematical modeling together with satellite data adjusted to take
out the observed effects of other influences such as precipitation, air
temperature, the amount of light, and land-use changes.”
R. Donohue, 2013
Change in greenery, 1981-2011