Green house effects on earth

1. GREEN HOUSE EFFECTS
Presented by-
ABIR TASRIF ANTO
111-23-2364

2. What is Green House
In the cold countries,
vegetables and essential
crops are produced in
glass house which can
hold the heat from
sunlight and the
atmosphere inside the
glass house remains hot
at night. This house is
called green house.

3. Green House Effects
• Earth’s atmosphere is slightly warmer than what it should be
due to direct solar heating because of a mild case of Green
House Effect.
• The ground is heated by visible and (some) infrared light
from the Sun.
• The heated surface emits infrared light.
• The majority of Earth’s atmosphere (N2 and O2) are not
good greenhouse gas.
• The small amount of greenhouse gases (H2O, CO2) traps
(absorb and re-emit) the infrared radiation, increasing the
temperature of the atmosphere

4. Mechanism

5. Mechanism
1. Shorter, high energy
wavelengths hit the
earths surface.
2. Incoming energy is
converted to heat.

6. Mechanism
3. Longer, infrared
wavelengths hit
Greenhouse gas
molecules in the
atmosphere.
4. Greenhouse gas
molecules in the
atmosphere emit infrared
radiation back towards
earth.

7. Green House Gases

8. Selected Green House Gases
Carbon Dioxide
Source: Fossil fuel burning, deforestation .
Anthropogenic increase: 30%
Average atmospheric residence time: 500 years
Methane
Source: Rice cultivation, cattle & sheep ranching,
decay from landfills, mining .
Anthropogenic increase: 145%
Average atmospheric residence time: 7-10 years
Nitrous oxide
Source: Industry and agriculture (fertilizers)
Anthropogenic increase: 15%

9. How CO2
controls Green House effect
• Carbonate minerals form in the oceans at a higher rate.
• The rate at which the oceans dissolve CO2 gas increases,
pulling CO2 out of the atmosphere.
• The reduced atmospheric CO2 concentration leads to a
weakened greenhouse effect that counteracts the initial warming
and cools the planet back down.
• If earth cools a bit,
• Carbonate minerals form more slowly in the oceans.
• The rate at which the oceans dissolve CO2 gas decreases,
allowing the CO2 released by volcanism to build back up in the
atmosphere.
• The increased CO2 concentration strengthens the greenhouse
effect and warms the planet back up.

10. THANK YOU ALL