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...climate change. Past land use offers us some important clues. For example, a number of sites across East Africa demonstrate the impact of switching to more drought-sensitive New World crops such as maize. Maize was introduced in 1608 and since then it has largely replaced more traditional and drought-resistant crops such as cassava or sorghum. Maize provides excellent...

...climate change debate in 1987 or so, working for The Economist, and I was alarmed. I looked at the numbers people were saying, I looked at the increasing carbon dioxide levels, looked at the Jani equation for how much warming this was likely to produce, and reported it straight, as it were, as a very alarming prospect. I became a little more sceptical in the nineties when...

...climate changes, though, the cold isn't wiping out the eggs and larvae as the year turns; hence the moose, having failed to remove them, are being bitten raw by the little parasite. Richard Conniff, writing at TakePart, explains the size of the problem: Even more ticks pile onto the moose the following winter. In their efforts to dislodge these pests, the moose rub so...