CAUSES & IMPACT ON ENVIRONMENT

GREEN HOUSE EFFECT & ITS GASSES

AR.SHUJAAT ALI QASMI

SSUET ARCHITECTURE KARACHI

MADE BY:

What is Green House?What is the pre-history of Green House?What is Green House Effect?What is the causes of Green House effect?Selective Absorbers & the Green House

Effect!What does a greenhouse gas do? What happens when more and more

greenhouse gases go into the atmosphere?What happens when the Earth gets warmer?Result of Green House effect!!!

OUTLINE

A Greenhouse (also called a Glasshouse) is

a building in which plants are grown.

These structures range in size from small sheds to very large buildings. A miniature greenhouse is known as a cold

frame.

What is Green House?

The idea of growing plants in environmentally controlled areas has existed since Roman times. The Roman gardeners used artificial methods (similar to the greenhouse system) of growing to have it available for his table every day of the year.

Giant greenhouses in the NetherlandsBut the first modern greenhouses were

built in Italy in the 13th century.

Pre-History Of Green House :

What is Green House Effect? The Greenhouse effect is a process that is naturally

occurring on our planet. The reason it is a concern is many scientists believe the process is being changed

because of our use of energy in the last 100 years or so. When this energy hits the earth, the earth in turn reflects that energy back toward the sun. But the earth has an atmosphere it is surrounded by a shield of water vapor, carbon dioxide and other so-called “Greenhouse gases." The main greenhouse gas is Water vapor. The greenhouse gases also function to reflect some of the sun's radiation away from out planet, so it does not get too much energy from the sun.

Sun energy passes through atmosphere

26% is reflected or scattered

19% absorbed by clouds, gases and

particles4% reflected to space

by Sun

51% reaches the surface

Process of the Green House Effect

Water is the most important/potent of greenhouse gas.

Water vapor is transparent to short wavelength radiation and transmits solar radiation to the Earth's surface with little attenuation. However, water absorbs longer wavelength radiation (IR) from the Earth.

Selective Absorbers & the G.H.e

CO2 is not very abundant but it is a potent greenhouse gas that we are able to increase in the atmosphere . By contrast, H2O is already saturated and its amount in the atmosphere cannot be increased. Increasing CO2 content in the atmosphere by burning fossil fuels is thought to result in global warming. Global warming results in more atmospheric water thus increasing the greenhouse effect — feedback

Deforestation

Burning of Fossils

Electrical Appliances

Population Growth

Causes of Green House Effect:

Water vapor(H2O)

Carbon-dioxide(CO2)

Nitrous Oxide(N2O)

Methane (CH4)

Example of Heat Trapping Gases:

Greenhouse gas works like a great space blanket that keeps the heat in. So the sun's rays heat up the earth, and the greenhouse gases stop the heat reflecting back out to space. So the earth gradually gets

warmer Global Warming.

What does Green House Gases Do?

Most scientists agree that CO2 plays a role in warming the Earth through the greenhouse effect.

However, the somewhat controversial hypothesis is that increased (anthropogenic?) CO2 in the atmosphere may enhance the warming of our planet.

CO2 Plays a Role:

The figure shows that the concentration of CO2 in the atmosphere has been steadily increasing since the mid-1700's. This corresponds with the Industrial Revolution and the increased use of fossil fuels (especially coal).

These data were obtained from trapped air bubbles in ice layers from Simple Station (Antarctica)

A greenhouse gas (sometimes

abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. Greenhouse gases greatly affect the temperature of the Earth; without them, Earth's surface would be on average about 33 °C (59 °F)colder than at present

What happens when more and more greenhouse gases go into the atmosphere?

The Ice at the north and south poles will melt, causing the sea levels to rise. The increase in temperature will affect the weather. Eventually the ozone layer "our protection from the sun will deteriorate, and we will feel the true heat

of the sun‘s rays.

What happens when the Earth gets warmer?

Result of Green House effect!!!

Global warming Sea level rise Economic impact Agricultural impact Effects on aquatic systems Effects on hydrological cycles Health Direct effects of temperature rise Spread of disease