The following are the major causes of environmental crisis.
1. Rising Population: The population explosion and affluent consumption have placed an undue and excess burden on the environment.The resources are increasingly exhausted day by day, but the regeneration of resources is constant. So, when the resources are extracted at a rapid pace than its regeneration, then the carrying capacity of the environment reduces. Then environment fails to perform its function of sustaining life, consequently, resulting in an environmental crisis.
2. Global Warming: Global warming is the result of rising temperature globally due to the emission of green house gases, especially, carbon dioxide. The rise in temperature accelerates the melting of polar ice leading to the rise of water level in the sea. This leads to ecological imbalances.
3. Ozone Depletion: Ozone depletion is another major concern that is caused due to the excessive use of chlorofluorocarbon (CFCs) in the air conditioners and refrigerators. As ozone depletes, the possibility of ultra violet radiations penetrating into earth surface increases, posing a threat to the living organisms.
The cumulative effect of the above factors is the environmental crisis.