Carbon Dioxide Levels Cross 400 ppm Threshold, Likely Highest in Millions of Years
USA Today, September 30, 2016
USA Today, September 30, 2016
San Diego-Union Tribune, September 23, 2016
San Diego-Union Tribune, September 26, 2016
NPR, September 26, 2016
San Diego Union-Tribune, September 26, 2016
NBC San Diego, September 24, 2016
San Diego Union-Tribune, September 21, 2016
Los Angeles Daily News, September 15, 2016
San Diego Union-Tribune, September 15, 2016
San Diego Union-Tribune, September 3, 2016