Carbon Dioxide levels in atmosphere reach 400ppm

 Photograph: Richard Vogel/AP 

In may 2013, the highest ever recorded greenhouse gas levels in the atmosphere was reached, according to Hawaii's Mauna Loa observatory, where record CO2 increases are being documented.  

An article in the Guardian:

http://www.guardian.co.uk/environment/2013/may/10/carbon-dioxide-highest-level-greenhouse-gas?INTCMP=ILCNETTXT3487

I will do a blogpost about the impact of rising CO2 and other greenhouse gas emissions soon, but in short:

CO2 in the atmosphere is important to maintain the earths temperature because it's molecules absorbs some of the earth's re-emitted infrared radiation and emits it in all directions and heats up the atmosphere by increasing their bond vibrational energy and kinetic energy. Too much CO2, as is scarily the case, and too much of this infrared is absorbed and stays in the earth's atmosphere, leading to certain global warming and climate change.