Discuss the positive and negative impacts of globalization in the second half of the 20th century6/6/2023 In December 2014, atmospheric carbon dioxide concentration stood at 399 parts per million by volume (ppmV), over 100 ppmV above the previous maximum level of around 280 ppmV recorded in the Vostok ice core. ![]() The human imprint on carbon dioxide is unmistakable. ![]() The increase in atmospheric carbon dioxide concentration provides a useful measure with which to evaluate the rate and magnitude of human-driven change compared to natural variability.
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