Ozone The Earth's atmosphere is divided into many layers. The lowest region, the troposphere, extends from the Earth's surface up to about 10 kilometers in altitude. Virtually all human activities occur in the troposphere. Mt. Everest, the tallest mountain on the planet, is only about 9 km high. The next layer, the stratosphere, continues from 10 km to about 50 km. Most atmospheric ozone is concentrated in a layer in the stratosphere, about 15-30 kilometers above the Earth's surface. …showed first 75 words of 509 total…

…showed last 75 words of 509 total…and stockpiled CFCs will be available for use in developed countries like the US. This production phase-out is possible because of efforts to ensure that there will be substitute chemicals and technologies for all CFC uses. Anyone can also help, primarily by ensuring that technicians working on air conditioning and refrigeration equipment are certified by EPA, that refrigerants are recaptured and not released, and by educating himself or herself about the issue of ozone depletion.