Question

Please explain the science needed to analyse the environmental issues of; Studying the historic correlations between the temperature on Earth and other factors.

Answer 1

Temperature is an important factor which keeps the living beings to survive on the earth.

Water vapour and CO2 absorbs radiation from the earth and emmitts the radiation in longer wavalengths,they will warm the earth this is called global worming. Atually the percentage of CO2 in the atmosphere is 0.03% day by day it is increasing so the emmissionof radiation increases alternatively the temperature on the earth increases.the climate changes appropriately.

Without the greenhouse effect overnight temperatures would plunge and the average surface temperature would be about minus 18°C, about the same as on the moon, which lacks the shroud of our atmosphere. We owe the difference of some 33°C substantially to natural levels of water vapour (60%, or more including clouds) and carbon dioxide in the Earth’s atmosphere.

As well as the band consideration, methane is stronger greenhouse gas because it has more atoms in the molecule than CO₂. The radiative effect is caused by infrared absorption, and molecules with more atoms absorb more infrared energy. IR absorption is by the electrons that bond between atoms in a molecule and the way those atoms vibrate. More bonds = more vibrations = more IR absorption. Diatomic molecules, like O₂ and N₂ which mostly make up our atmosphere, absorb very little IR. CO₂, with two bonds, absorbs some IR, but it is the next most abundant gas so its effect is significant.

The major role of water vapour in absorbing thermal radiation is in some respects balanced by the fact that when condensed it causes an albedo effect which reflects about one third of the incoming sunlight back into space. This effect is enhanced by atmospheric sulfate aerosols and dust, which provide condensation nuclei. Nearly half the sulfates in the atmosphere originate from sulfur dioxide emissions from power stations and industry, particularly in the northern hemisphere.