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GREENHOUSE EFFECT AND GLOBAL WARMING Alessandra Vizioli and Sara Pepe PowerPoint PPT Presentation

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GREENHOUSE EFFECT AND GLOBAL WARMING Alessandra Vizioli and Sara Pepe Liceo Scientifico «Galilei» – class : II A English Teacher : Professoressa Miscia Roberta.

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Alessandra Vizioli and Sara Pepe

Liceo Scientifico «Galilei» – class: II A

English Teacher:

Professoressa Miscia Roberta

The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases and is radiated back in all directions.

Greenhouse gases are those gases present in the atmosphere which absorb and emit solar radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.

Chlorofluorocarbons are a group of highly dangerous greenhouse gases, that pollute the atmosphere. They are due to the use of aerosols, hairspray cans, fridges, plastic materials.

A chlorofluorocarbon is an organic compound that contains only carbon, chlorine and fluorine, produced as a volatile derivative of methane and ethane.

The effects of global warming, caused by the excessive concentration of greenhouse gases in the atmosphere, are:

Floods: water inundations of lands that are normally dry. Floods often cause damage to houses and nature. While some floods develop slowly, others, instead, are “flash floods” like tsunamis, which can develop in just a few minutes and without visible signs of rain, causing appalling consequences.

Drought: a long period of abnormally low rainfall that adversely affects growing or living conditions. It can have a substantial impact on the ecosystem and on the agriculture of the affected region. Although droughts can persist for several years, even a short, intense drought can cause significant damage and harm to local economy.

Desertification:a type of landdegradation in which a relatively dry land or regionbecomesincreasinglyarid, typicallylosingitsbodies of water aswellasvegetation and wildlife. Itiscaused by climatechange and human activities. Desertificationis a significant global, ecological and environmentalproblem.

Glaciersare the world’s largest reservoirs of water on our planet. Hence, the melting ofglaciers can create severe environmental havoc, like sea levels increase, floods and water shortages in the years to come.

In conclusion:

As human beings, we are the onlyoneswho can reduce the riskswe are alldangerouslyrunning.

The world is «in ourhands»!

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