September 2018 Atmospheric CO2 Content 405.51 ppm; September 2017 403.37; September 2016 401.05

[hatrack]

https://www.esrl.noaa.gov/gmd/ccgg/trends/data.html

[saidsimplesimon]

1. tick tock

The President may shut down NOAA for behaving responsibly if he gets wind of this scientific certainty that climate change has been underway for decades and getting worse without regulation and preventative action.

[pscot]

2. So much winning

[NNadir]

3. Actually, being a post El-Nino year, this year was in the beginning rather mild.

There were actually two weekly readings that were under a 1 ppm level as compared to the same week per year, the first since 2011.

This compares well with 2016 when there were 11 reading above 4.00 ppm week to week over the previous air - and 2015 was no picnic.

But things are clicking up. In September 2018, we had a 2.53 and a 2.74, which would have been dramatic in every year of the 20th century except 1998, when South East Asia's rain forests burned.

We are not even close to addressing this problem, and decades of reports and promises and wishful thinking have done nothing.

[NickB79]

4. We'll break 500 ppm by 2050

Maybe sooner, if positive feedback loops keep accelerating.