Global destruction caused by manThe greenhouse effect and ozone depletion are two of the most widespread environmental problems globally today. Greenhouse gases have the ability to absorb infrared radiation from the sun. Global warming refers to an increase in global average temperature due to natural and anthropogenic causes. Ozone depletion describes an observed 4% decline in ozone per decade in the total volume of the Earth's stratosphere and seasonal ozone depletion events. Ozone levels in the stratosphere are normalizing due to the Montreal Protocol, but the concentration of greenhouse gases in the atmosphere is increasing and we may see the melting of permafrost in Siberia and Alaska that contains large amounts of methane which could lead to “changes irreversible environmental factors” Greenhouse effect: in addition to water vapour, six main greenhouse gases are present in our environment: carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons and sulfur hexafluoride. The first three are found naturally in the atmosphere, the others are synthetic and used in industry or as by-products of industrial processes. Carbon dioxide: Carbon dioxide is produced through the respiration of all aerobic organisms, emitted from volcanoes and other places where the earth's crust is located. thin and emitted from carbonate rocks by dissolution, found in lakes, deep under the sea and mixed with oil and gas deposits. It is also produced in artificial environments in coal or hydrocarbon production and fermentation in beer and wine production. Methane: Methane is produced in natural environments in a process called methanogenesis which is used by microorganisms as an energy source CO2 + 8 H+ + 8 e− → CH4 + 2 H2O. It's four......middle of the paper......one/ozone_holemap_650.jpg. [Accessed April 26, 2014].Alternatives to CFCs - EasyChem - The definitive resource for HSC chemistry: point-to-point study notes/summaries based on the syllabus, past exam papers and more. 2014. Alternatives to CFCs - EasyChem - The definitive resource for HSC chemistry: point-to-point study notes/summaries based on the syllabus, past exam papers and more. [ONLINE] Available at: http://www.easychem.com.au/monitoring-and-management/the-atmosphere/alternatives-to-cfcs. [Accessed April 26, 2014].Log in - The New York Times. 2014. Sign in - The New York Times. [ONLINE] Available at: http://www.nytimes.com/2014/05/12/us/politics/rubio-says-he-is-ready-to-be-president.html?_r=0. [Accessed 14 May 2014].2014. . [ONLINE] Available at: http://www1.ncdc.noaa.gov/pub/data/cmb/images/indicators/800k-year-co2-concentration.gif. [Accessed May 14 2014].