Global Economy

“Mexicans discovered vulcanization 3,500 years before Goodyear,” said Dorothy Hosler, an M.I.T. professor of archaeology and ancient technology. “The Spanish had never seen anything that bounced like the rubber balls of Mexico.”

Dr. Ochsendorf, a specialist in early architecture and engineering, said the colonial government tried many times to erect European arch bridges across the canyons, and each attempt ended in fiasco until iron and steel were applied to bridge building.

The Inca suspension bridges achieved clear spans of at least 150 feet, probably much greater. This was a longer span than any European masonry bridges at the time. The longest Roman bridge in Spain had a maximum span between supports of 95 feet. And none of these European bridges had to stretch across deep canyons.

Seeds of domesticated squash found by scientists on the western slopes of the Andes in northern Peru are almost 10,000 years old, about twice the age of previously discovered cultivated crops in the region, new, more precise dating techniques have revealed.

The excavations also yielded peanut hulls and cotton fibers — about 8,500 and 6,000 years old, respectively

Their research also turned up traces of other domesticated plants, including a grain, manioc and unidentified fruits, and stone hoes, furrowed garden plots and small-scale irrigation canals from approximately the same period of time.

The cost of shipping a 40-foot container from Shanghai to the United States has risen to $8,000, compared with $3,000 early in the decade, according to a recent study of transportation costs. Big container ships, the pack mules of the 21st-century economy, have shaved their top speed by nearly 20 percent to save on fuel costs, substantially slowing shipping times.

Jeffrey E. Garten, the author of “World View: Global Strategies for the New Economy” and a former dean of the Yale School of Management, said that companies “cannot take a risk that the just-in-time system won’t function, because the whole global trading system is based on that notion.” As a result, he said, “they are going to have to have redundancies in the supply chain, like more warehousing and multiple sources of supply and even production.”

In a more regionalized trading world, economists say, China would probably end up buying more of the iron ore it needs from Australia and less from Brazil, and farming out an even greater proportion of its manufacturing work to places like Vietnam and Thailand.

“We’re focusing on the trade impact,” said Mr. Lin, a professor in the department of atmospheric and oceanic sciences at Peking University’s School of Physics. “Trade changes the location of production and thus affects emissions.”

“Dust, ozone and carbon can accumulate in valleys and basins in California and other Western states,” the statement said.Black carbon is a particular problem because rain does not wash it out of the atmosphere, so it persists across long distances, the statement said. Black carbon is linked to asthma, cancer, emphysema, and heart and lung disease.

The study’s scientists also looked at the impact of China’s export industries on its own air quality. They estimated that in 2006, China’s exporting of goods to the United States was responsible for 7.4 percent of production-based Chinese emissions for sulfur dioxide, 5.7 percent for nitrogen oxides, 3.6 percent for black carbon and 4.6 percent for carbon monoxide.

The human toll of coal vs. nuclear

Europe, Facing Economic Pain, May Ease Climate Rules

On Wednesday, the European Union proposed an end to binding national targets for renewable energy production after 2020. Instead, it substituted an overall European goal that is likely to be much harder to enforce.

Available Classifications

Beijing’s Bad Air Would Be Step Up for Smoggy Delhi

The Myth of Industrial Rebound

On Germany’s coast, for example, an estimated $1.3 billion went into revitalizing ports and factories to serve the industry, creating about 10,000 jobs. But demand frequently drops off when projects stall, at times leaving factories in coastal towns like Cuxhaven, on Germany’s North Sea, sitting idle with hundreds of workers laid off.

Pupils in Finland, Korea, Japan and Canada consistently score much higher than their peers in Germany, Britain, America and France.

In each country, the Americans are startled by how hard their new peers work and how seriously they take their studies. Maths classes tend to be more sophisticated, with lessons that show the often fascinating ways that geometry, trigonometry and calculus work together in the real world.

Classrooms tend to be understated, free of the high-tech gadgetry of their schools back home. And teachers in every subject exhibit the authority of professionals held in high regard.

Recent

The magic is in that head: GE has put a small heat pump up there, and the GeoSpring pulls ambient heat from the air to help heat water. As a result, the GeoSpring uses some 60 percent less electricity than a typical water heater. (You can also control it using your iPhone.)

The GeoSpring is an innovative product in a mature category

We really had zero communications into the assembly line there.”

Death by Finance

First, emerging-market hype is just that. Economic miracles rarely occur, and for good reason. Governments that can intervene massively to restructure and diversify the economy, while preventing the state from becoming a mechanism of corruption and rent-seeking, are the exception.

the rapid industrialization that they engineered has eluded most of Latin America, the Middle East, Africa, and South Asia.

No Big Deal

Basically, old-fashioned trade deals are a victim of their own success: there just isn’t much more protectionism to eliminate.

Implicit protection of services — rules and regulations that have the effect of, say, blocking foreign competition in insurance — surely impose additional costs.