Hence the amount of ozone becomes depleted. Loss of the protective ozone layer in the upper atmosphere may be a faraway event, but its significance to life on earth is profound. Scientists concerned about global warming view Earth as operating like a greenhouse. If global warming raises temperatures several degrees, some predictions are that changes in the earth's climates could have severe impacts on agriculture and everyday living. The dilemma about the greenhouse effect and global warming is that while an increase in CO2 has been detected, it has been difficult to demonstrate that it is linked to appreciable changes in atmospheric temperatures on a worldwide basis.
Some scientists remain skeptical about whether the issue is one to worry about.