PUT SOME CARBON IN YOUR PENCIL!!

We've tipped the 400 ppm (parts per million) of Carbon Dioxide in the atmosphere.  Union of Concerned Scientists has this to say on their website.  http://www.ucsusa.org/news/press_release/carbon-level-of-400-ppm-0381.html

 "For the first time in human history, the daily mean concentrations of carbon dioxide in the atmosphere reached 400 parts per million (ppm). The National Oceanic and Atmospheric Administration’s Mauna Loa Observatory, near the top of Mauna Loa on the big island of Hawaii, recorded the level yesterday.  The observatory has been documenting global atmospheric carbon dioxide levels since 1958 and maintains the world’s longest unbroken record of such measurements."

Of course you can listen to the climate change deniers or to scientists.  I'm sticking with the scientist.