Global warming is caused by a rise in temperature of the earth's atmosphere due to an increase in carbon dioxide and other greenhouse gases from human activities like burning fossil fuels and deforestation. Some of the effects of global warming include climatic changes, rising sea levels, more extreme storms, and ecological disruptions. Predictions indicate the planet will continue to warm throughout the 21st century with potentially severe environmental consequences if emissions are not reduced.

1. GLOBAL WARMING
Meaning
 Rise in temperature of globe(earth)
 Coming of every year will be hottest
 Carbon- dioxide contributes to global warming
 Major supplies of carbon dioxide gas to the
atmosphere are:
i. Eruption of valcanoes
ii. Respiration of living organism
iii. Decay of dead organisms
iv. Burning of fossil fuels
v. Cultivation of land

2. Contribution to global warming
 Industrial process- 24%
 By deforestation- 14%
 By agriculture- 13%
 By energy use-49%
Composition of sunlight
 Sunlight- consist of three types of radiations.
 Ultra-violet radiation, visible radiation and infra-red radiation
 Infra-red radiation are heat rays
 They heat the earth and atmosphere
 The temperature of earth’s atmosphere increases
 This results in global warming
Causes of global warming
 Human activity
 Human caused releases of gases
 Burning fossil fuels
 Contribution of carbon dioxide released through human activities

3. Effects of global warming
Climatic change
Human influence on climate
Carbon- dioxide levels growing in atmosphere
To slow down economic growth
To avoid polluting technologies

4. Predictions of global warming
 Global warming not evenly distributed
 Some places experience high temperature
 Ecological disruptions could be severe
 There will be rise in sea levels
 Increase in violent storms
 Global change in environment
 Warmest years, late 1980, early 1990s
 Atmosphere more warm during 21st century
 Valcanoes, fluctuations in sun’s activity and ozone
 It allows oceans to effect land and vice versa.

5. Global catastrophes
Climatic change can destroy earth
Global catastrophe costing millions of lives
Widespread flooding by rise in sea level in
2005.
By 2020, shortage of water and energy supply
will lead to war.
Nuclear conflict, mega droughts, famine,
rioting will erupt by 2020.

6. Results of tsunami
 Tsunami toll, 1,50,000 in the world
1200 in India
2000 crore loss due to tsunami
Rare birds, flora- fauna became extinct
Several damages to ecological resources
Damages to India’s eco- resource forests,
coastal wet lands

7. Acid rain
Acid rain due to pollution in air emitted by
factories and vehicles.
Wet form of acid deposited in air constitute
acidified rain, snow, fog, cloud vapor
Soil is polluted due to acid rain