The methane!
From Yahoo News UK Rob Waugh Contributor November 20, 2018
Millions of termite mounds built by a single species are as old as the pyramids and cover an area bigger than Great Britain (PA)
"It’s a construction project unlike any on our planet: it’s the size of Great Britain, and has been going on for 3,820 years, since the Pyramids were first built.
But no humans have been involved in the huge landscape of 200 million mounds in Brazil – it was all built by termites.
Researchers in northeast Brazil sampled soil in 11 locations and found that some of it began nearly four thousand years ago.
Each mound is actually waste from a huge subterranean tunnel network where the termites have laboured for thousands of years.
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