Ozone depletion describes two distinct but related phenomena observed since the late 1970s: a steady decline of about four percent in the total amount of ozone in Earth's stratosphere (the ozone layer), and a much larger springtime decrease in stratospheric ozone around Earth's polar regions.
As ozone level goes down this results in less protection from sun rays and more exposure of UV radiations at the earth’s surface. Which plays a major and minor both roles in effects. Bad effects on the body might be SKIN CANCER and other losses. Malignant melanoma, basal and squamous cell carcinoma are the most common cancers, UV radiations are harmful to human eye too.
It creates holes in the atmosphere, which allow powerful ultraviolet rays from the sun to reach the Earth's surface.
Ozone depletion occurs when chlorofluorocarbons (CFCs) formerly found in aerosol spray cans and refrigerants are released into the atmosphere. These gases, through several chemical reactions, cause the ozone molecules to break down, reducing ozone ultraviolet (UV) radiation-absorbing capacity.
Cars consume a lot of energy before they ever make it to the open road. Most of an automobile's environmental impact, perhaps 80 to 90 percent, will be due to fuel consumption and emissions of air pollution and greenhouse gases that climate scientists say are driving global warming.
The major greenhouse gas is carbon dioxide (CO2) and nearly all CO2 comes from fossil fuels and land use change. But methane (CH4) and nitrous oxide (N2O), which mostly come from agriculture and waste, are also significant GHGs and shouldn't be discounted.