We may be headed for the worst case scenario:
At no time in the past did humans exist under conditions that we are facing now, no matter how far back you go in history.
Global mean methane levels as high as 1840 parts per billion were recorded on August 4, 2015. This is the highest mean level since records began and this new record is likely to be superseded by even higher levels soon.
Methane releases from the seafloor of the Arctic ocean threaten to cause rapid local warming that in turn will trigger further methane releases, in a vicious cycle of runway warming that could destroy habitat for humans within decades.
The situation is dire and calls for comprehensive and effective action as discussed at the Climate Plan at the Arctic-News Blog.