It said they contain large amounts of plastic and flammable insulation, which can cause large fires that spread quickly and highly toxic gases.
When they then fired chemical weapons, the toxic gases seeped in and often pooled in the cellars, proving even more deadly, she said.
These so-called fairy circles have variously been pinned on the presence of other, poisonous plants, on ants, and even toxic gases rising from below.
Most of these deaths occur in developing countries where larger amounts of harmful chemical compounds such as toxic gases and particulate matter are released in the atmosphere.
On Tuesday, state pathologist Prof Jack Crane said the levels of hydrogen sulphide and other toxic gases were high enough to render the men unconscious.
Natural gas has other advantages over coal: It produces far fewer emissions of toxic chemicals and gases that contribute to climate change, key attributes as tougher environmental rules go into effect.
Japan had hoped to get away with simply building a factory ship that would process the poisonous gases and toxic chemicals in a Chinese port and float away when the job was done.
As a reporter for the Times noted in her article, the lessons talked about the benefits of coal and the pervasiveness of power plants fueled by it, but omitted mention of the environmental and economic trade-offs, such as toxic waste and greenhouse gases.
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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Others are expected soon that will tighten caps on toxic metals like mercury, acid gases and particulate matter.
The researchers suggest that while the upper layers of Messel Lake were hospitable enough to allow turtles to live, its deeper layers may have been a toxic death trap, perhaps from the buildup of volcanic gases or poisonous decaying organic matter.
Hydroelectric dams are under assault for killing fish, biomass burning produces greenhouse gases just as fossils do, and geothermal power releases toxic ground and water contaminates.
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