2. INTRODUCTION
The greenhouse effect is a process by which
thermal radiation from a planetary surface is
absorbed by atmospheric greenhouse gases, and
is re-radiated in all directions.
Thais reradiation results in an elevation of
average temperature of earth.
Earth’s natural green house effect is necessary
for keeping an optimum temperature
3. HISTORY
The existence of the greenhouse effect was
argued for by Joseph Fourier in 1824
In 1917 Alexander Graham Bell wrote ―[The
unchecked burning of fossil fuels] would have a
sort of greenhouse effect‖, and ―The net result is
the greenhouse becomes a sort of hot-house.‖
4. MECHANISM
The Earth receives energy from the Sun in the
form UV, visible, and near IR radiation
Most of which passes through
the atmosphere without being absorbed.
Of the total amount of energy available at the top
of the atmosphere (TOA), about 50% is absorbed
at the Earth's surface.
Greenhouse gases—including most diatomic
gases with two different atoms (such as carbon
monoxide, CO) and all gases with three or more
atoms—are able to absorb and emit infrared
radiation.
5. GREEN HOUSE GASES AND
THEIR ROLE IN GREEN HOUSE
EFFECT
Water vapor, 36–70%
carbon dioxide, 9–26%
methane, 4–9%
ozone, 3–7%
6. REASONS FOR ENHANCED
GREEN HOUSE EFFECT
Strengthening of the greenhouse effect through
human activities is known as the enhanced
(or anthropogenic) greenhouse effect.
This increase in radiation forcing from human
activity is attributable mainly to increased
atmospheric carbon dioxide levels.
CO2 is produced by fossil fuel burning and other
activities such as cement production and tropical
deforestation.[
7. Natural
Greenhouse
effect
More heat is
trapped and
causes global
warming
Atmosphere traps
some heat
Some heat
goes out to
space
Quite a lot of heat
is trapped and the
earth is warm
enough for life.
Enhanced
Greenhouse
effect
Heat radiates
from the earth
Heat radiates
from the earth
Atmosphere
has more
greenhouse
gases
Atmosphere traps
more heat
Less heat
goes out
to space
8. SOLUTIONS
Reduce the consumption of fossil fuels and
entertain the use of renewable energy
sources.(wind energy, solar energy etc..)
Reducing greenhouse gas emissions from "non-
energy" sources.There are large amounts of
greenhouse gas emissions that come from "non-
energy" sources. One major area is
waste.Organic wastes emits large amount of
methane.
Capturing and storing greenhouse gas
emissions: A new approach that is being tested in
many locations is the use of technology to
capture greenhouse gas emissions and store
them underground, instead of allowing them to
