Kassem @kassem CC BY-NC-SA 1/12/2014 1 1 Carbon Dioxide▻http://climate.nasa.gov/vital-signs/carbon-dioxide PROXY (INDIRECT) MEASUREMENTS http://www.keepbanderabeautiful.org/co2-emissionst-400000-years-nasa.gif #co2 #climat Kassem @kassem CC BY-NC-SA
