Charles Mann

In our day the Soviet Union disintegrated after drought caused a series of bad harvests in the 1970s and 1980s, but nobody argues that climate ended Communist rule. Similarly, one should grant the Maya the dignity of assigning them responsibility for their failures as well as their successes.

Over time, the Meggers-Roosevelt dispute grew bitter and personal; inevitable in a contemporary academic context, it featured charges of colonialism, elitism, and membership in the CIA.

Experiments by Makoto Ogawa of the Kansai Environmental Engineering Center, near Kyoto, Japan, demonstrated that charcoal retains its carbon in the soil for up to fifty thousand years. “Slash-and-char is very clever,” Ogawa told me. “Nobody in Europe or Asia that I know of ever understood the properties of charcoal in soil.”