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I sort of doubt the blue jet explanation by Xeren is probable (although it is a possibility). It's just too rare and too faint. Much more likely, it's lightning far away near the horizon. Just because there are no clouds doesn't mean the light wont scatter. Sunlight makes the sky very bright blue during the day, and in the brief moment when lightning ...


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It is estimated that aviation is responsible for 12% of transport CO2 emissions worldwide at present (2015 data), with an additional effect due to NO2 and induced O3. Transport itself contributes just over a quarter of all CO2 emissions, with the other main contributions from power (electricity) production, industry, commercial and residential sources, and ...


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Various types of apparent temperature have been developed to combine air temperature and air humidity. For higher temperatures, there are quantitative scales, such as the heat index. For lower temperatures, a related interplay was identified only qualitatively; e.g., in a 2012 textbook: High humidity and low temperatures cause the air to feel chilly Or ...



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