Samples taken from the paths showed levels of dioxins and heavy metals - feared as cancer-causing by-products of waste incineration - 800 times above safety guidelines.
The Luddites wished to return to a more natural way of life, in which skilled craftsment could ply their trade and make a living, and in which civilization was not ravaged by all the ills of industrialization (including heavy metals and other factory-produced toxins poisoning millions).
It's estimated the red cloud of heavy metals is now affecting a 30km (19-mile) stretch of the River Danube.
Small enough to fit in the bed of a large pickup truck, the Ferrator strips electrons from iron atoms to make ferrate--an unstable molecule that bonds to and neutralizes heavy metals, phosphates and bacteria.
Those that use photovoltaic collectors are also challenged on environmental grounds because they are manufactured using highly toxic heavy metals, explosive gases and carcinogenic solvents that present end-of-life disposal hazards.
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In August 2011, Speth and his chief engineer finally broke through more than two meters of earth and reinforced concrete and the shelter's 278-millimeter-thick ceiling to emerge into a 40-square-meter space, divided into five interconnecting rooms by heavy metals doors.
The Anthropocene's equivalent of iridium is nitrogen - although there will be other candidates (such as heavy metals, and carbon isotope ratios characteristic of fossil fuel emissions) for geochemists of the far future to identify as the chemical signature of the new epoch's dawn.
But the bulls have more heavy lifting to do in the near term to lift those precious metals out of their near-term technical funk.
Soil contamination has long been an issue in China, were rapid industrialization and lax enforcement of environmental-protection laws have resulted in the pollution of large swathes of arable land with a variety of heavy metals.
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