Earth's CO2 Passes the 400 PPM Threshold--Maybe Permanently
- Tue 27 Sep 2016 08:00:PM
Carbon dioxide levels often hit lows in September, but now remain above a crucial benchmark
-- Read more on ScientificAmerican.com
Source: Earth's CO2 Passes the 400 PPM Threshold--Maybe Permanently
-- Read more on ScientificAmerican.com
Source: Earth's CO2 Passes the 400 PPM Threshold--Maybe Permanently