Coyote Blog

I kid you not

So how did Genghis Khan, one of history's cruelest conquerors, earn such a glowing environmental report card? The reality may be a bit difficult for today's environmentalists to stomach, but Khan did it the same way he built his empire — with a high body count.

Over the course of the century and a half run of the Mongol Empire, about 22 percent of the world's total land area had been conquered and an estimated 40 million people were slaughtered by the horse-driven, bow-wielding hordes. Depopulation over such a large swathe of land meant that countless numbers of cultivated fields eventually returned to forests.

In other words, one effect of Genghis Khan's unrelenting invasion was widespread reforestation, and the re-growth of those forests meant that more carbon could be absorbed from the atmosphere.

Weirdly, the author equates cooling the Earth with "a glowing environmental report card?"  How did cold become green?

In fact, the world did substantially cool in the 14th century.  The previous 300 warm years had brought prosperity and growth to Western Europe, in fact the first population growth in Europe since as early as 300AD.  The commercial and intellectual regression that is often called the Dark Ages or the early Middle Ages (say 700-1000AD) is often attributed to a demographic collapse in Western Europe.  There are many who credit, at least in part, this collapse for the fall of the Western Roman Empire.

The years 1000-1300 saw a real recovery, the first population growth for hundreds of years, and a number of important (though to us prosaic) technological, intellectual and societal advances. There are several factors behind this boom, but a large one is the Medieval Warm Period, where we can find records of certain crops (e.g. grapes in England) being grown far north of where they can be even today.

The early 1300's coincided with the return of cold, wet weather to Europe.  Whether this is in part attributable to Genghis Khan's killing rampage, I can't say.  But the effects were clear.  The 1320's and 1330's saw a series of terrible harvests and resulting famines.   By the 1340's, much of Europe was hungry and malnurished, weakening the population for the arrival of some rats carrying Bubonic Plague.  Again, not a few historians have noted that the climate-change-induced famines of the early 1300's likely made the early plagues more virulent.

This world of failed harvests, starving, and plagues -- this is a greener world we should aspire to?

(HT:  A reader)

Cameron Scott argues this when he says:

It's funny how green-haters accuse greens of being catastrophists, and then argue that cutting carbon emissions will destroy our economy and send us back to the Dark Ages. (See the trailer of Phelem McAleer's Not Evil Just Wrong for a prime example.)

Well, the last pooh-pooh is on them: It turns out we're already cutting emissions in the United States. Sure, some of that is due to a sluggish economy. But negative economic circumstances don't account for the 9 percent reduction in carbon emissions since 2007. In fact, the amount of carbon dioxide produced for every dollar of economic output declined by 3.8 percent in 2008.

I responded:

I really wish you would apply your analytical abilities to equities so I would have some way to bet against you.

Had you looked, you would see that the US has been reducing the CO2 intensity for a unit of economic output for decades. Here is the first source I found online but there are zillions.  In terms of improvement, the US has done better on this metric in the last 20 years than nearly any other country in the world, and just as well as the best (e.g. Germany)

So what you tell is not a new story, and has nothing to do with recent governmental dictats or pleas by environmentalists and everything to do with the ongoing incentives of individuals and businesses to reduce costs and be more efficient.

The reason our total Co2 output has not decreased is that while CO2 per unit of GDP (I will call this CO2 efficiency) has improved 2-4 percent per year, our GDP has grown the same rate or faster. So our overall CO2 output is flat to up (and has actually been down the last few years). One of the main reasons Europe has done better than the US in total CO2 reductions is not improvements in CO2 efficiency, but because their economies have lagged. They bent over backwards in Kyoto to make 1990 the baseline year, so they could include the horrible economies of Russia and East Germany which were in the process of crashing, thus giving them an automatic CO2 reduction for nothing.

Anyway, just look at your own numbers. In the year before, we got about 3% improvement in Co2 efficiency and had about 3% economic growth so CO2 output was flat to down. Last year we had about 3% improvement in Co2 efficiency and the economy was down a lot and thus CO2 was down a lot. When there are two variables in a function, and only one is changing, most logical people attribute the change in output of the function (ie changes in total CO2 output) to the variable that changed (ie economic growth). You, for some reason, attribute changes in the output to the variable (co2 efficiency improvements) which basically remained unchanged. Nice analysis.

You can even see it in your numbers. If CO2 efficiency is up 3.8 percent and Co2 output is down 9 percent, then that means the economic growth/size component has to be down 5.4% (.91/.962 - 1). So almost 60% of the "improvement" is due to a very bad recession and 10% unemployment, but you attribute it to the unchanging 40% piece.

Did anyone in the environmental movement study math or economics?