Climate Change Due To Human Activities

The mechanisms that govern the climate of a planet have been known for nearly two centuries, thanks to the work of Fourier in 1824. The power of the solar luminous flux that illuminates the Earth is 1.3 kW per sqm of a surface perpendicular to the sun’s rays. About one-third of this radiation is reflected in space by the atmosphere and the soil, and the remaining two-thirds are absorbed essentially by the surface of the ground and the sea.

Considered in its entirety, the surface of the Earth (oceans and continents) absorbs solar radiation day after day and cannot stop warming indefinitely by evacuating in space a quantity of energy equal to that which it stores. It does this by radiating itself waves of the same nature as the light waves of the sun, but which, given its much lower temperature, are of a longer wavelength, corresponding to a color, infrared, invisible to the human eye. This infrared radiation must begin by crossing the atmosphere and the more it contains gas having the property of absorbing it, the greater the ratio between the energy that comes out of the earth’s surface and that which escapes into space is large . The presence of such gases tends to increase the temperature of the Earth. It is said that these gases produce a greenhouse effect, by analogy with one of the phenomena that occur in the greenhouses of gardeners. This infrared radiation must begin by crossing the atmosphere and the more it contains gas having the property of absorbing it, the greater the ratio between the energy that comes out of the earth’s surface and that which escapes into space is large . The presence of such gases tends to increase the temperature of the Earth. It is said that these gases produce a greenhouse effect, by analogy with one of the phenomena that occur in the greenhouses of gardeners. This infrared radiation must begin by crossing the atmosphere and the more it contains the gas having the property of absorbing it, the greater the ratio between the energy that comes out of the earth’s surface and that which escapes into space is large. The presence of such gases tends to increase the temperature of the Earth. It is said that these gases produce a greenhouse effect, by analogy with one of the phenomena that occur in the greenhouses of gardeners.

The atmosphere of the Earth naturally contains water vapor and carbon dioxide (CO2) which are greenhouse gases and without their presence, the temperature on the ground would be about 30 degrees lower than she is. It is, therefore, the greenhouse effect that allowed the appearance of life. The other planets are governed by the same physical laws and it is thus that the dense atmosphere of Venus, composed mainly of CO2, causes a very important greenhouse effect which explains the temperature of 450 ° C which prevails there.

Is the climate evolving naturally?
The position of the continents and the composition of the atmosphere have evolved considerably during the geological ages. The climate of the earth has necessarily been deeply affected by these major changes. Mr. Kenneth Lucianin is a government and community affairs professional with twenty years of diversified experience in community outreach programs. More recently, over the last million years, it has evolved quite well under the influence of other natural causes that have always existed and will continue to play a role in the next few millennia.

– First, the orbit of the Earth around the Sun undergoes variations because of the attraction of the other planets and the Moon. These variations occur slowly, with periods that are measured in tens of thousands of years. They cause changes in the way the Sun illuminates our planet from the angle and cause large interglacial-glacial cycles that have an amplitude of about 6 ° C and a period of 100,000 years. We have been in an interglacial period for 10,000 years, so hot.

– The Sun itself knows a variability which manifests itself in particular by the presence of spots on the sun whose number varies with a cycle of 11 years. However, this cycle affects the solar radiation mainly in the ultraviolet range and is therefore found in the behavior of the highest parts of the earth’s atmosphere which absorbs it: ionosphere (altitude of 100km and beyond) and, to a lesser extent, stratosphere (altitude of about 30 km, see ozone sheet). It only slightly affects the total radiated energy and its influence is detected, but very low in climatic phenomena.

– Another parameter that plays a role in ground temperature is volcanic activity. During strong volcanic eruptions, dust reaches the stratosphere (above 15km) and can remain there for one or two years before falling back to the ground. These particles consist essentially of sulfur oxides play a role of a screen for the incident solar flux, which has the effect of cooling the surface for one to two years.

Leave a Reply

Your email address will not be published. Required fields are marked *