• 350 ppm CO2 = 1°C warming (a warming we can live with, see 350.org)
• 400 ppm CO2 = 1.5°C warming (things get worse for an increasing number of people)
• 445 ppm CO2 = 2°C warming (dangerous warming, but the best we can hope for)6
2°C warming is a guardrail beyond which changes become catastrophic
• 560 ppm CO2 = 3°C warming (really bad: and positive feedbacks accelerate)
• 700 ppm CO2 = 4°C warming (To be avoided at all costs)7
6. (PDF download) Hansen et al. state that 2°C warming could be dangerous.
7. (PDF download) Turn Down The Heat: Why a 4°C Warmer World Must be Avoided.
We passed 400 ppm CO2 last year.
At current emission rates that are increasing CO2 at a rate of 2 ppm/year, we will blow past the budget for staying below 2°C warming within 20 years.The only possibility for avoiding 2°C warming is for humans to alter their behavior and reduce energy use while we bring low-carbon energy sources online. The Paris Accord is o…
In the second chapter of my novel I developed a group of people, I called "alarmists", loosely based on the 19th Century Abolitionists, who take the battle for global warming to the oil industry. This is coming true.
Ken Ward, 61, a longtime environmental activist from New England, closed a shut-off valve on Kinder Morgan’s Trans Mountain pipeline near Mount Vernon, Wash. Leonard Higgins, 66, a soft-spoken Unitarian and retired state-government employee from Corvallis, Ore., closed a shut-off valve on the Enbridge Express Pipeline near Coal Banks Landing, Mont. Emily Johnston, 51, an editor and a poet, and Annette Klapstein, 65, a retired attorney for the Puyallup tribe, traveled together from Seattle to Leonard, Minn., and turned the shut-off valves on a pair of pipelines owned by Enbridge. The five men and women said little about themselves, dwelling instead on what they saw as the existential threat of climate change and the inadequacy of available legal remedies. “I’m…