Methane from Siberian gas could accelerate warming , raise costs . Economic models suggest that additional tab could hit $ 60 trillion . The gas is more potent than carbon dioxide in trapping CO₂ . `` Up to now , you 've had offshore permafrost , which is a relic of the last ice age . The study is a warning but ` ` not doom and doom , '' he says .
Methane from Siberian gas could accelerate warming , raise costs . Economic models suggest that additional tab could hit $ 60 trillion . The gas is more potent than carbon dioxide in trapping CO₂ . The study is a warning but ` ` not doom and doom , '' he says .