class 9 computer notes cbse chapter green skill
Answers
Explanation:
The Green Skills Agreement defines skills for sustainability as " Skills for sustainability, also known as green skills, are the technical skills, knowledge, values and attitudes needed in the workforce to develop and support sustainable social, economic and environmental outcomes in business, industry.
Answer:
Types of Pollution : There are three major types of pollution
1. Land Pollution : Damage to the land because of harmful substances is known as land pollution.
2. Water Pollution : Adding harmful substances and disease causing bacteria and other microorganisms to rivers, lakes, and oceans results in water pollution.
3. Air Pollution : Addition of harmful gases and particles in air results in air pollution.
Green House Effect : Burning of fossil fuels produce harmful gases like Carbon dioxide, methane. These gases trap and prevent the earth’s heat from escaping, leading to a global warming. This is called the “greenhouse effect”.
Ozone Layer : This layer in the atmosphere protects us from the harmful radiation (ultra violet) . It is made up of gas called ‘Ozone’. Refrigerators and Airconditioners, etc., release chlorofluorocarbons in the atmosphere. These substances destroy the ozone in the atmosphere, making ‘holes’ in the ozone layer.
3R’s (Reduce, Reuse and Recycle) : There are three Rs which we can apply for saving the environment :
1. Reduce : We should reduce the use of unnecessary items like avoid buying disposable items and also avoid asking for plastic carry bags. Use your own reusable cloth or jute bags instead of plastic bags.
2. Reuse : It means to use the already used materials for other purposes, such as making pillow covers or rags out of used shirts or ladies suits.
3. Recycle : Recycling is reusing some components of the waste that may have some economic value. for example Plastic items are recycled into new plastic products.
Conservation of Natural Resources : Conservation is the proper management of a natural resource to prevent its exploitation, destruction or degradation. Conservation is the sum total of activities, which
can derive benefits from natural resources but at the same time prevent excessive use, which may lead to
destruction or degradation.
Soil Conservation : Soil conservation means checking soil erosion and improving soil fertility by adopting various methods. Soil conservation can be useful for the following:
Maintenance of soil fertility.
Control on grazing.
Reforestation
Terracing
Contour ploughing
Water Conservation : It is the practice of using water judiciously and avoid wasting of water. It is essential for the survival of mankind, plants and animals. This can be achieved by adopting the following methods:
Growing vegetation in the catchment areas, which will hold water in the soil.
Constructing dams and reservoirs to regulate supply of water to the fields.
Rainwater harvesting should be done.
Energy Conservation : Conservation of resources or energy means saving them and using them efficiently. It can be done by adopting the following ways:
Switch off lights, fans, TV and other electrical items, when not in use
Use tube lights and energy efficient bulbs that save energy rather than bulbs.
Keep the bulbs and tubes clean.
Use pressure cooker to save energy required for cooking.
Keep vessels covered with a lid during cooking.
Food Conservation : Food conservation and storage have been practiced to feed mankind in times of shortage. Food is stored in warehouses on large scale and in refrigerators at home.
Forest Conservation : Forest conservation means the retention of existing forest or the creation of new forest at the levels prescribed by the State or local authority.
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