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Topics
Introduction
Constituents of forests
Food chain
Humus and decomposers
Characteristics of forest
Importance of forest
Introduction
Air pollution and its control
Noise pollution
Water pollution and its control
Solid wastes
Agro-chemicals and their effects
Greenhouse effect and global warming
Ozone depletion in the stratosphere
Degradation by improper resource utilization and maintenance
Deforestation
Class 7 Biology Forests: Our Lifeline
Greenhouse effect and global warming
Greenhouse effect and global warming
The greenhouse effect is a naturally occurring phenomenon that is responsible for heating of Earth’s surface and atmosphere.
Carbon dioxide and methane are commonly known as greenhouse gases.
Greenhouse effect is important to increase the temperature which is essential for the organisms to live.
Due to the increase in the level of greenhouse gases the Earth gets heated which is known as
Global warming.
Fig. greenhouse effect
Effects of global warming-
Deleterious changes in the environment and resulting in odd climatic changes.
Increased melting of polar ice caps as well as of other places like the Himalayan snow caps.
Rise in sea level that can submerge many coastal areas.
Cutting down use of fossil fuel
Improving efficiency of energy usage
Reducing deforestation,
Planting trees and slowing down the growth of human population.
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