dannyastro writes: A recent paper by climate scientist James Hansen and others analyzed global temperature data and found that summertime "Extremely Hot Days" (defined as +3-sigma temperatures during the period 1951-1980) are now occurring more than 10 times more often. Therefore, the study concludes, we can say with very high confidence that the recent Texas and Moscow heat waves were "caused" by global warming because the probability of them occurring without global warming is negligible. Furthermore, they add that "Additional global warming in the next 50 years, if business-as-usual fossil fuel emissions continue, is expected to be at least 1C. In that case, the further shifting of the anomaly distribution will make +3-sigma anomalies the norm and +5-sigma anomalies will be common."
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