David Dodman at the International Institute for Environment and Development in London, who led the study, says previous claims that cities contribute disproportionately to global climate change are unfounded.
"Historically, people have associated pollution and environmental damage with cities and, as far as climate warming goes, it is true that urban areas have large energy consumption," he says. "But many emissions come from rural areas, and methane is a far more potent greenhouse gas than carbon dioxide."
About 15 metres long and weighing 45 tonnes, the creature is a new species of pliosaur, and ruled the Jurassic seas some 147 million years ago.
Predator X had a head twice the size of Tyrannosaurus rex and its bite had four times the force, at around 15,000 kilograms (33,000 pounds). Its teeth were each around 30 centimetres (1 foot) long.
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