Fact: The planet Earth, our home, is about 8000 miles wide.
Fact: The useful part of our atmosphere, which we can breathe, fly through and provides our weather and climate is about 8 miles thick.
Take a beach ball of diameter 1 metre and the useful atmosphere is a mere 1 millimetre thick.
Have a look at pictures of the earth from space. http://images.jsc.nasa.gov/search/search.cgi?searchpage=true&selections=AS17&browsepage=Go&hitsperpage=5&pageno=11 or from the moon http://www.nasa.gov/multimedia/imagegallery/image_feature_102.html.
Now you know how precarious life on this rock is.
PLEASE LOOK AFTER PLANET EARTH
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