First, these aren't primarily "peak oil" photos, they're "population overshoot / damage to the planet photos".
Second, they appeal to emotion, but not to mathematical or scientific rigor. (Given the state of modern education, that may be completely necessary, when talking to the masses.)
Let's take the second to last photo about Mexico City as an example. The caption says "population 20 million, density 24,600/mile (63,700/square kilometer)".
a). What does 24,600 per mile mean? Do they mean 24,600 per SQUARE mile?
b). Assuming they mean square mile in a and aren't just babbling nonsense, the idea of an average square kilometer having well over twice the people of an average square mile in the same city is COMPLETE nonsense. A square kilometer is WELL under half a square mile.
Spending about ONE minute on the internet to check Mexico City population density, I get two decent looking sites that are in rough agreement. Here is the one that seemed the most credible, offhand:
http://www.mexicocityvibes.com/mexico-city-population/MEXICO CITY POPULATION DENSITY
25400 PER SQUARE MILE
9800 PER SQUARE KILOMETRE
It looks to me offhand like they did the math BACKWARDS, based on the ratio of population they give, and didn't bother to check their facts/computation for even ONE minute, based on their population per square mile being in rough agreement with reality.
So to test my backwards math hypothesis:
1 km = roughly .62 miles
http://www.metric-conversions.org/lengt ... -miles.htmSo 1 km squared - roughly .62 * .62 miles or .3844 square miles.
.3844 * 63,700 bad figure the photo gives = 24,486.
Bingo -- close enough using round figures to call it a match.
I realize that photographers aren't expected to know much math. But shouldn't published materials have EDITORS with access to people who know how do do arithmetic, assuming they expect to have a little credibility in what they publish?
Or not. How can actual data compete with pictures of dead animals?
Given the track record of the perma-doomer blogs, I wouldn't bet a fast crash doomer's money on their predictions.