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Then, in the summer of 1991, a catastrophic train derailment just north of town spilled nearly 20,000 gallons of a highly toxic herbicide into the Sacramento River.

"The Gaza rubble is a very, very toxic environment," says Professor Bill Cookson, director of the National Centre for Mesothelioma Research in London.

You don’t want to contaminate community compost piles with toxic plants.

In a post on his blog, Knoepfler called Colossal’s claims “colossal baloney” and warned, “this kind of hype is toxic and harmful to science including public trust.”

He said: "You can't beat the far right by acting like them; legitimising their toxic rhetoric simply makes them louder and draws more media attention."