The main culprit for climate change is our emissions of Carbon Dioxide, and because of that, the rise in temperature and the rise in the concentration of carbon Dioxide in our atmosphere have been synchronously rising for decades. But, Carbon Dioxide levels have just reached a new level in, what scientist think, could be the history
of the earth, reaching 420 Parts Per Million, or PPM. So today we ask what is the science behind measuring PPM and what do the levels being above 420 mean for the future of our Earth? To answer that I interviewed Chelsea Harvey. She is a climate change reporter for E and E News.