Global Warming

Our objective is to treat the following topics:

What global warming means?

Which is the main cause?

Which are its effects?

Which are its consequences?

What measures can we take?

Global warming is the unusually

rapid increase in Earth’s average surface

temperature over the past centur

primarily due to the greenhouse gases

released because people burn fossil

fuels. The global average surface

temperature rose 0.6 to 0.9 degrees

Celsius (1.1 to 1.6° F) between 1906

and 2005, and the rate of temperature

increase has nearly doubled in the last 50

years. Temperatures are going up further.

Here, we can specify:

The Greenhouse Effect, the process by which absorption and emission of infrared radiation by gases in the atmosphere warm a planet`s lower atmosphere and surface.

The Volcanism, which contributes to increase the temperature through gases (especially CO2) contained by magma and volcanic ash that obturates solar radiation.

Human activity, which has increased the amount of greenhouse gases in the atmosphere, leading to increased radiative forcing from CO2, methane, tropospheric ozone and nitrous oxides.

We have here effects on:

* Atmosphere: the increase of

vaporization, rainfall and a lot

of storms;

* Lithosphere: the increase of ground

temperature , which produces forest

fires.