随着大气二氧化碳（CO2）浓度持续升高，人体血液中的 CO2 水平也在悄然攀升。如果这一趋势不加遏制，几十年内，一项关键血液指标可能逼近健康警戒线。相关论文发表于《Air Quality, Atmosphere & Health》杂志。
The key is to lower the stakes. Make it less of a big deal. Don’t focus on what could go wrong. Also, don’t focus on how amazing this could be. You are just saying, “It’s cold today, isn’t it?” You are not asking someone to join you on a quest for world peace. Similarly, if an approach is made towards you and you don’t want to respond, just be confident and clear either with your gestures (look down, don’t make eye contact) or with speech: “I can’t talk right now.”，更多细节参见电影
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Российский телеведущий пожаловался на испражняющихся на улицах одной страны людей20:47。关于这个话题，PDF资料提供了深入分析