.....he worst fallout from China's quest for natural resources will be seen not in the countries they come from, nor in the countries that are competing for supplies, but in China itself. Over the past few years the volume of raw materials it consumes per unit of output has risen sharply. In particular, China has gone from miser to glutton in its use of energy, and is now struggling to diet. That has involved bigger imports of oil, gas and coal, and so more foreign entanglements. But it has also led to the rapid depletion of resources that China cannot import, such as clean air and water.

China is building a huge stock of grimy heavy industry, just as its coastal provinces are getting rich enough to care about the consequences. Protests about environmental issues are on the increase. There is not enough water in the Yellow River basin, which covers a huge swathe of northern China, to supply both farmers and factories. Acid rain from coal-fired power plants is reducing agricultural yields, raising the spectre of increased rural unrest. As it is, the authorities are struggling to ensure that the air will be fit for athletes to breathe at the Olympics in Beijing this summer. All the while, the number of noxious steel mills, cement kilns and power plants relentlessly increases. Global warming, which is fed by their fumes, will make all these problems even worse.

Environmental concerns are unlikely to bring down the Communist regime, or even to stir as much resentment as the arbitrary confiscation of land currently does among China's poorest. But those concerns are certainly prompting the government to reflect on what sort of economic path it wants to pursue. So far, its efforts to temper economic growth, encourage energy efficiency and wean the country off heavy industry have had little effect. But continued failure would eventually make China a less prosperous and more unstable place.