400 ppm

News

CO2 Levels Already Topped 400 PPM This Year, On Track To Cross Threshold For A Month

Published: 
Tue, 03/18/2014 - 4:02pm
Category: 
Energy

Last year, atmospheric carbon dioxide briefly crossed 400 parts per million for the first time in human history. However, it didn’t cross that threshold until mid-May. 

News

Climate Warnings, Growing Louder

Published: 
Tue, 05/21/2013 - 10:42pm
Category: 
Energy

Given new evidence on carbon pollution, President Obama should get moving on global warming.

News

We've Hit the Carbon Level We Were Warned About. Here's What That Means.

Published: 
Mon, 05/13/2013 - 11:36pm
Category: 
Energy

Over the last couple weeks, scientists and environmentalists have been keeping a particularly close eye on the Hawaii-based monitoring station that tracks how much carbon dioxide is in the atmosphere, as the count tiptoed closer to a record-smashing 400 parts per million. 

News

Heat-Trapping Gas Passes Milestone, Raising Fears

Published: 
Sun, 05/12/2013 - 11:09am
Category: 
Energy

The level of the most important heat-trapping gas in the atmosphere, carbon dioxide, has passed a long-feared milestone, scientists reported Friday, reaching a concentration not seen on the earth for millions of years.