ashu g lobal

ASHISH KUMARAFB- 2011-13003

GREEN HOUSE EFFECT AND GLOBAL WARMING

INTRODUCTION

Global warming refers to the rising average temperature of Earth's atmosphere and oceans.

In the last 100 years, Earth's average surface temperature increased by about 0.8 °C (1.4 °F) with about two thirds of the increase occurring over just the last three decades.

GREENHOUSE VS GLOBAL WARMING The greenhouse effect & global warming

are not the same thing. Global warming refers to a rise in the

temperature of the surface of the earth. An increase in the concentration of

greenhouse gases leads to an increase in the the magnitude of the greenhouse effect. (Called enhanced greenhouse effect) This results in Global warming

How Global Warming Works

Fossil fuels (coal, oil, natural gas)

Carbon Dioxide (CO2)

HOW CO2 CONNECTED TO GLOBAL WARMING? Physically, via the greenhouse effect. The connection is usually made via the

use of a climate model. If the scenario run results show warmer

surface condition than the control, then it is plausible to suspect that the increasing CO2 concentration in the atmosphere may cause warming.

SELECTED GREENHOUSE GASES Naturally occurring amounts of

greenhouse gases have a mean warming effect of about 33 °C (59 °F)

The major greenhouse gases are water vapor which causes about 36–70 percent of the greenhouse effect

Carbon Dioxide (CO2) Source: Fossil fuel burning, deforestation Anthropogenic increase: 30% Average atmospheric residence time: 500 years

Methane (CH4) Source: Rice cultivation, cattle & sheep ranching,

decay from landfills, mining Anthropogenic increase: 145% Average atmospheric residence time: 7-10 years

Nitrous oxide (N2O) Source: Industry and agriculture (fertilizers) Anthropogenic increase: 15% Average atmospheric residence time: 140-190 years

The Sun’s energy passes through the car’s windshield.

This energy (heat) is trapped inside the car and cannot pass back through the windshield, causing the inside of the car to warm up.

Example of the Greenhouse Effect

GREENHOUSE EFFECT

Sun

Effects of Global WarmingIncreased Temperature

Habitat Damage and

Species AffectedChanges in Water

Supply

Rising Sea Level

What’s the proof that global warming is

taking place?

Portage Glacier

1914 2010

• Alaska

Photos: NOAA Photo Collection and Gary Braasch – WorldViewOfGlobalWarming.org

Colorado River• Arizona

June 2002 Dec 2008

What’s being done now to reduce our emissions?

Solar Power Wind Power Fuel-Efficiency

We can stop global warming!

Scientists agree that the burning of fossil fuels is causing global warming. Since these fuels are burned for energy, and everyone uses energy, everyone can help stop global warming just by using less energy or energy from renewable sources!

How we can reduce global warming?

Simple Things To Do

Turn off your computer or the TV when you’re not using it.

Take shorter showers. Heating water uses energy.

Keep rooms cool by closing the blinds, shades, or curtains.

Turn off the lights when you leave a room.

Use compact fluorescent bulbs.

A

Simple Things To Do

Dress lightly when it’s hot instead of turning

up

the air conditioning. Or use a fan.

keep the air filters on your AC and

furnace clean.

Walk short distances instead of asking for a ride in the car.

Plant a tree.

Recycle.

CONCLUSION

Most warming is probably the result of human activities.

There will be positive and negative (mostly) repercussions from global warming.