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                                               MAN AND NATURAL WORLD.

1. Animportant environmental problem in the atmosphere is the greenhouse effect. Some gases in the atmosphere work like glass in a greenhouse. They are known as "greenhouse gases". Theylet heat in, but they don't let much hea out. So the  atmosphere becomes warmer. The greenhouseeffect is very important; if it did not occur at all, the temperature of the plenet would be 40 degrees lower and the oceans would freeeze. But an increase in the greenhouse effect ( caused bt an increase in the concentration of greenhouse gases in the atmosphere ) may lead to global warming.

2. We tend to imagine that ancient people were " environmentally friendly " and lived in harmony with nature. Some people (such as the American Indians) did indeed respect and protect  their environment. But there are many examples of ancient people who destroyed the land they lived on.

   The great city of Ur was destroyed by floods after its people removed the trees on the banks of the river Euphrates to use as fuel for their fires. Although the Bible says that the cause of floods was the anger of God, the real cause of the flood was probably environmental damage by man.