New data from Antarctica have just given us our highest-resolution look yet of carbon dioxide during the last 67,000 years. Ancient ice cores contain samples of old air and give evidence that today's levels of CO2 are unlike anything in over 400,000 years. “We can see the sharp recent increase in carbon dioxide that humans have caused, mainly by burning fossil fuels for energy. The graph used to show this jump is arguably the most iconic figure in climate science.” Benjamin Strauss, Chief Scientist at Climate Central, explains in his article on climatecentral.org.