Global warming

Probably the most important lesson we can learn from astronaut observations is that air, oceans, lands, and all life forms are parts of one family. Everything is connected to everything else. A rise in the temperature of the Pacific Ocean, for instance, can cause storms and floods on the other side of the planet. These observations have opened our eyes to the unity and diversity of life on this little, blue planet, slowly turning on its axis in the darkness of space.

The North Pole	Visual effect on Earth
The South Pole Digitally enhanced hole in the ozone layer	Damage to the ozone layer over time between 1979 and 1996

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