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At 415 ppm, carbon dioxide level is at highest ever in human history
Earth's CO2 hits highest recorded level in human history - exceeding 420 parts per million
MeCCO Monthly Summaries :: Media and Climate Change Observatory
What is climate change? A really simple guide - BBC News
RealClimate: Not just another dot on the graph?
The carbon skyscraper - International Science Council
Effects of acute exposures to carbon dioxide on decision making and cognition in astronaut-like subjects
Just how 'Sapiens' in the world of high CO2 concentrations?
Increased levels of carbon dioxide could reduce brainpower, study finds
RealClimate: Not just another dot on the graph?