[BurningFrog]

If this is a reference to the "we only have 12 years to save the planet" meme, that is just a thing that went viral.

There is no science behind it.

[kmonsen]

Because there is no clear line between saving and not saving. It's just degrees of badness the longer we wait. I heard there are some inflection points when it becomes warm enough for methane to escape from the tundra in Siberia.

[matthewdgreen]

It is a reference to how quickly we are depleting our carbon budget to avert certain levels of warming.