The day is going to come, sometime before the end of the century, when people are suddenly struck with how high methane levels are, and realize there is nothing that can be done about stopping it.

Because what is going to happen is the oceans are going to outgas as the water along the continental shelves warm.

Warm water dissolves less gas that cold water.

When the methane clathrates sublimate faster and faster, the only end result is a much hotter world.