The impact of winter on oxygen levels due to frozen plants is minimal, as the overall variation in oxygen is negligible. Additionally, while one hemisphere experiences winter, the other enjoys summer, balancing the effects on global oxygen levels. In extreme environments like the Sahara and polar regions, survival challenges stem more from temperature extremes rather than a lack of oxygen or plants. In jungles, despite abundant plant life and oxygen, dangers arise from high humidity, insects, and wildlife. The conclusion suggests that urban living may be safer due to lower exposure to certain lethal environmental factors like nitrogen dioxide (NO2) and sulfur dioxide (SO2).
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