Is global warming caused by human activity? Why or why not …

In actuality, because of its very thin atmosphere, Mars’ surface temperature is well below freezing , with atmospheric pressure less than 1% of Earth’s. The air contains only traces of oxygen, meaning Mars has no ozone, so much of the Sun’s damaging UV radiation passes unhindered to the surface. ….

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Is global warming caused by human activity? Why or why not …

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