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This does not explain the cooling period observed between 1940 and 1970. the reason for this cooling is due to emissions of SO2 into the atmosphere before and around that time. Since laws and restrictions against CFC's and emitters of SO2 have come into place, this cooling period has ceased and the warming trend observed between 1910 - 1940 has since continued. On this basis alone I can state that the article is incorrect in its findings