With all of the global warming a new threat has emerged, the release of methane gas, trapped in methane hydrates on ocean floors. It's release is often referred to as the 'methane bomb'.
The last time a 'methane bomb' went off on earth, 80% of life on earth vanished (about 250 million years ago).
Once you get pas the opening music, you will see a Russian Climatologist slowly get more choked up and emotional as she explains that it is entirely possible that the next methane bomb will happen from the East Siberian Arctic Shelf in the next few decades. It doesn't even need to be a complete release, if only one percent of the methane hydrate trapped under that ice escapes, it will double the current methane in the atmosphere and trigger a massive climate shift.