As surely as the rains fall and flowers blossom, the Northern Hemisphere awakens every June to another, less inspiring rite of spring—a new peak level for global atmospheric carbon dioxide. This year, that number is 419 carbon dioxide molecules for every million molecules of air, a.k.a. parts per million.
Click here for original story, CO2 reaches its highest level in more than 4 million years
Source: Phys.org