Natural resources are the materials which are required for the survival and prosperity of human beings. They are objects, materials,creatures or energy found in nature that can be used by humans. A Resource is something that is useful and valuable in the condition in which we find it. Natural resources are not equally distributed in or on the earth. All resource use bears a cost to nature. Human activities have misused, abused and over-used the natural resources.
A forest is an area with a high density of trees. The trees grow to different heights. Forests are home to 50-90% of earth’s species. Forests meet the social, economic ,ecological, cultural and spiritual needs of human society.
Water is an essential natural resource for sustaining life. Water forms 60% of our body weight. Water is a renewable and limiting resource. About three – fourth of earth’s surface is occupied by oceans. About 97.5% of the earth’s water is strong saline. The rest 2.5% is fresh water. Pure, usable water on land is only 0.3%.
Land is one of the major life supporting systems. It forms about one fifth of the earth surface. Soil covers about four fifth of the land area. A fertile soil is a living soil containing billions of living organisms in every cubic centimeter. Solar energy is the natural fuel that drives the soil cycles. The activities of living organisms all sizes are interdependent and combine harmoniously to provide the nourishment that sustains all life on earth. Soil erosion is the removal of top soil by physical agents like wind, water, ice etc. Depletion of soil fertility is caused by removal of vegetation, water logging and application of non-degradable chemicals.
The major source of our food are plants / plant products and animal meat / animal products.
Major problems of modern agriculture - Intensive farming reduce fertility and productivity of soil. Increase soil salinity. Over use of chemical fertilizers contaminate soil and ground water. Excessive use of pesticides and herbicides kill beneficial soil organisms.
Air is one of the natural resources and is a life-supporting system. It forms the immediate environment of the earth and biosphere. Organisms can respire oxygen and survive in the world. Rainfall in any area depends on wind or air current. Wind has been used to generate electrical energy. Ozone protects the earth from Ultra violet rays. Nitrogen is an important mineral nutrient for plants. Air acts as a medium for some microorganisms. Water vapor maintains atmospheric humidity and in precipitation.
Minerals are exhaustible, non-renewable. Minerals are relatively plentiful. Minerals are extremely expensive. Minerals are extremely expensive. Disposal of minerals have negative effects on environment. Metallic minerals - e.g., iron, copper, silver, gold etc. Non-metallic minerals -e.g. Sand, stone, salt, phosphates.
Life depends on energy flow through ordered structures of matter. Energy is produced usually from fuel burning and atom splitting. About 70% of the world population has no sufficient access to energy.
Perpetual resources - are not
affected by human use E.g., sunlight and wind .
Renewable resources –are replenished through biogeochemical and physical cycles.
Renewable resources are of two types : 1.Critical and Sustainable renewable resources e.g., forests. 2. Non-critical and Everlasting renewable resources e.g., water
Renewable resources are of two types : 1.Critical and Sustainable renewable resources e.g., forests. 2. Non-critical and Everlasting renewable resources e.g., water
Forest resources
Functions of Forest Resources –
Productive functions - timber, bamboos, food, essential
oils,resins, alkaloids, latex, medicines etc.
Protective functions - conservation of soil and water; Prevention of drought ; Protection
against, wind, cold, radiation, noise.
Regulative functions - Absorption, storage and release of
gases, water, mineral elements and radiant energy; Regulation of floods, droughts and
biogeochemical cycles.
Effects of deforestation - Unregulated precipitation, runoff water and floods; Influences of rainfall pattern; Increased
soil erosion and decreased soil fertility; extinction of organisms; Induces regional and global climate
change; reduces forest resources; threatens the survival of tribes.
Water resources
Conservation of water resources –
- increase irrigation efficiency and
reduce water wastage.
-recycle industrial waste water.
-construct waste water treatment plants.
-reduce domestic water wastage.
-adopt rainwater harvesting methods.
-protect watersheds and afforestation to
improve water economy.
-never dump wastes and garbage in streams and
river.
Land Resources
Soil conservation :
Conservational tillage – Ploughing improves soil permeability, soil moisture and nutrients.
Organic farming – More organic inputs to soil.
Crop rotation – Growing legumes after cereal crops.
Contour ploughing – Ploughing with alternate furrows and ridges.
Mulching – Soil is allowed to remain untilled and is covered with plant litter.
Strip cropping – Planting in rows or strips.
Terrace farming – Slope is converted into terraces.
Agrostological methods – Grasses are grown in rotation or along with agricultural crops (lay farming).
Afforestation – Trees or wind breaks are planted in deserts.
Food resources
Major problems of modern agriculture - Intensive farming reduce fertility and productivity of soil. Increase soil salinity. Over use of chemical fertilizers contaminate soil and ground water. Excessive use of pesticides and herbicides kill beneficial soil organisms.
Air resource
Mineral resources
Energy resources
Types of energy resources –
Renewable – an
energy source that can be replenished in a short period of time. e.g.
solar energy, wind energy, hydro-energy, tidal
energy and geothermal energy.
Non-renewable – some energy sources cannot recreated in a short period of
time. e.g. Coal, petroleum and natural
Gas
Sustainable Conservation
Stabilizing population growth
The
relentless growth of population has been a critical factor in over utilizing
natural resources. Human race must willingly practice population
control.It should be stabilized at the level of carrying capacity.
2. Change-over in energy use
A
change – over is necessary from non-renewable polluting energy to renewable and
non-polluting.
3.Change – over in technology: Change is needed from resource –
intensive and pollution – prone technologies to environment – friendly
technologies.
4. Change – over is economy: The
economic development must be environmentally sensitive and sustainable.
5. Scientific conservation: Conservation
is the “global of efficiency”. Scientific methods should be followed to manage
nature and natural resources efficiently.
Quote for self-reflection
"Conservation is a state of harmony between men and land." -Aldo Leopold.
"Green economy is not a luxury of the rich,
but an imperative of the poor." -Nick Nuttall.
"Green economy is not a luxury of the rich,
but an imperative of the poor." -Nick Nuttall.
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