“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.”
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in title, tags, annotations or urlSuspension Bridges - Inca - Andes - New York Times - 0 views
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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.
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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.
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IEA - December:- Coal's share of global energy mix to continue rising, with coal closing in on oil as world's top energy source by 2017 - 0 views
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Although the growth rate of coal slows from the breakneck pace of the last decade, global coal consumption by 2017 stands at 4.32 billion tonnes of oil equivalent (btoe), versus around 4.40 btoe for oil, based on IEA medium-term projections. The IEA expects that coal demand will increase in every region of the world except in the United States, where coal is being pushed out by natural gas.
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“This report sees that trend continuing. In fact, the world will burn around 1.2 billion more tonnes of coal per year by 2017 compared to today – equivalent to the current coal consumption of Russia and the United States combined. Coal’s share of the global energy mix continues to grow each year, and if no changes are made to current policies, coal will catch oil within a decade.”
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The report notes that in the absence of a high carbon price, only fierce competition from low-priced gas can effectively reduce coal demand. “The US experience suggests that a more efficient gas market, marked by flexible pricing and fueled by indigenous unconventional resources that are produced sustainably, can reduce coal use, CO
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Michael Spence explores the causes of partial and stalled economic recoveries. - Project Syndicate - 0 views
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Indeed, recent data suggest that more than half of the acceleration in US growth is occurring on the tradable side, even though it accounts for only about one-third of the economy. And that contribution is probably an underestimate, because income generated on the tradable supply side produces income that becomes demand on the non-tradable side – a multiplier effect that crosses the tradable/non-tradable boundary.
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the main problem is that public-sector investment remains well below growth-sustaining levels. The hard part of fully realizing potential growth is shifting the composition of domestic demand from consumption to investment without adding leverage. That means paying for it on the public-sector side, via taxes and a reduction in household consumption (and in wealth accumulation).
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But such adjustments cannot happen in a monetary union, so unit labor costs are slowly re-converging via a protracted process of flat nominal wage growth and slowly declining real wages (a process that would be quicker with higher inflation in Germany and Northern Europe).
To Lower Tariffs, Vietnam Pushes for Easing Trade Rules - NYTimes.com - 0 views
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Europe generally requires what is known as a “double transformation” in goods for them to be considered made in a certain region. In the case of clothing, one step, or “transformation,” would be weaving yarn into a fabric. A second transformation would be assembling the fabric into a garment. The United States requires a “triple transformation” that extends back to the production of yarn from synthetic or natural fibers, like cotton.
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Lien Phat Ltd.'s factory,
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Its supplies are imported. “I mainly take orders from international corporations, who give us materials and designs,” said Truong Thi Thuy Lien, the owner of Lien Phat. “Usually the clients will designate us to certain suppliers, most of them are in China.”
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The Poor Need Cheap Fossil Fuels - NYTimes.com - 0 views
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In sub-Saharan Africa, for instance, excluding South Africa, the entire electricity-generating capacity available is only 28 gigawatts — equivalent to Arizona’s — for 860 million people. About 6.5 million people live in Arizona.
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Over the last 30 years, China moved an estimated 680 million people out of poverty by giving them access to modern energy, mostly powered by coal. Yes, this has resulted in terrible air pollution and a huge increase in greenhouse gas emissions. But it is a trade-off many developing countries would gratefully choose.
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Today, 81 percent of the planet’s energy needs are met by fossil fuels, and according to the International Energy Agency, that percentage will be almost as high in 2035 under current policies, when consumption will be much greater. The unfortunate fact is that many people feel uncomfortable facing up to the undeniable need for more cheap and reliable power in the developing world.
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