Four years ago last August, a group of us sat down in front of the White House holding placards with climate promises that President Obama had made during his campaign and waited to get arrested. We were there to protest the Keystone XL pipeline, which our nation's top climate scientist had said would be a fuse to the largest carbon bomb on the planet, but which the President was by all accounts looking to approve.
I think the stated aspiration of the 1.5C goal is purely for political purposes given the overwhelming obstacles to even achieving the 2C goal. The link below gives an idea of what it would take to for 1.5C goal and it is well beyond what countries seem willing to do. The key to keeping fossil fuels in the ground is probably not activities like stopping pipelines from being built, other pipelines and trains will carry the tar sands oil that Keystone would have carried, but an all out effort to improve energy efficiency in buildings and all modes of transportation and in industrial processes, and rapid deployment of solar and wind power on a much greater scale than we have seen.
Typical cognitive dysfunction from Henn. The Paris agreement is "So weak in some places that it amounts to an utter disaster." But "There's good language about reviewing country pledges and scaling up ambition every five years."
At this rate, when we get to 4 degrees centigrade, credulous "environmentalists" will still be touting the the "good language" results of their grassroots pressure.