Further scientific evidence has emerged to suggest that the Earth’s atmosphere is ‘saturated’ with carbon dioxide, meaning that at higher levels the ‘greenhouse’ gas will not cause temperatures to rise. A group of Polish scientists led by Dr. Jan Kubicki have published three papers recently, and according to the science site No Tricks Zone they summarise their evidence by noting that as a result of saturation, “emitted CO2 does not directly cause an increase in global temperature”. Current levels of CO2 in the atmosphere are around 418 parts per million (ppm) but the scientists state that past 400 ppm, “the CO2 concentration can no longer cause any increase in temperature”.