The Answerer

Because, I believe, God created this ’Blue Planet’ so that it is liveable to humans.

We have a perfect mixture of oxygen, nitrogen, carbon dioxide and neon, argon, crypton and zenon gases. Water evaporates and rain works to put moisture in the air as well. The trees take the carbon dioxide in the air and turn it into oxygen and wood and flowers (with nectar for bees to make honey. Yum!) and all sorts of good things.

In Australia the eucalyptus trees give off a gas that makes the hills look blue from a distance. The purple colour, some say blue, is the result of light from the sun shining through the 15 kilometres of the atmosphere.

It is all pretty good I say.