Sunday, July 25, 2021

Forest resources and effects of mining

FOREST RESOURCES

 Any material which can be transformed in a way that it becomes more valuable and useful can be termed as resource. In other words, it is possible to obtain valuable items from any resources.
Resources, therefore, are the means to attain given ends. Life depends upon a large 
number of things and services provided by the nature, which are known as Natural Resources. Therefore water, air, soil, minerals, coal, forests, crops and wild life are all examples of natural resources.

Forest Resources
Forest is important renewable resources. Forest contribute substantially to the economic development of any country. Plants along with trees cover large areas, produce variety of products and provide food for living organisms. In addition, they are essential to save 
the environment.

Significance of forests
Forest provide prosperity to human beings and to the nation. A few Important uses of forests are listed
  • Commercial values
  • Ecological significance
  • Aesthetic values
  • Life and economy of tribes
Commercial values
Forests are main source of many commercial products such as
  • wood, timber, pulpwood etc. 
  • Forest can provide food , fibre, edible oils and drugs.
  • Forest lands are also used for agriculture and grazing.
  • Forest is important source of development of dams, recreation and mining.
  • Forest provide food, medicine and other products needed for tribal people and play a vital role in the life and economy of tribes living in the forest.
Ecological uses
  • Forests are habitat to all wild animals, plants and support millions of species. 
  • They help in reducing global warming caused by green house gases and produces oxygen upon photosynthesis.
  • Forest can act as pollution purifier by absorbing toxic gases. 
  • Forest not only helps in soil conservation but also helps to regulate the hydrological cycle.
Aesthetic values
  • All over the world people appreciate the beauty and tranquillity of the forest because forests have a greatest aesthetic value. 
  • Forest provides opportunity for recreation and ecosystem research.
 Over exploitation of forests
  • Forests contribute substantially to the national economy. 
  • With increasing population increased demand of fuel wood, expansion of area under urban development and industries has lead to over exploitation of forest .
  • At present international level we are losing forest at the rate of 1.7 crore hectares annually. 
  • Overexploitation also occurs due to overgrazing and conversion of forest to pastures for domestic use.
Deforestation
  • Forest are burned or cut for clearing of land for agriculture ,harvesting for wood and timber , development and expansion of cities .
  • These economic gains are short term whereas long term effects of deforestation are irreversible
  • Deforestation rate is relatively low in temperate countries than in tropics 
  • If present rate of deforestation continues we may losses 90% tropical forest in coming six decades
  • For ecological balance 33% area should be under forest cover but our nation has only 20.6% forest cover.
 Causes of deforestation
  • Shifting cultivation or "jhum" cultivation
  • This practice is prevalent in tribal areas where forest lands are cleared to grow subsistence crops. 
  • It is estimated that principal cause of deforestation in tropics in Africa, Asia and tropical America is estimated to be 70, 50, and 35% respectively. 
  • Shifting cultivation which is a practice of slash and burn agriculture are posses to clear more than 5 lakh hectares of land annually. 
  • In India, shifting cultivation is prevalent in northeast and to limited extent in M.P, Bihar and Andhra Pradesh and is contributing significantly to deforestation.
Commercial logging
  • It is a important deforestation agent. It may not be the primary cause but definitely it acts as secondary cause, because new logging lots permits shifting cultivation and fuel wood gatherers access to new logged areas.
  • Need for fuel wood due to Increased population which has lead to increasing demand for fuel wood which is also acting as an important deforestation agent, particularly in dry forest.
  • Expansion for agribusiness leads to the addition of cash crops such as oil palm, rubber, fruits and ornamental plants which in-turn leads to an expansion in the area for agribusiness products which results in deforestation.
Development projects and growing need for food
  • The growing demand for electricity, irrigation, construction, mining, etc. has lead to destruction of forests. 
  • Increased population needs more food which has compelled to increase the area under agriculture crops compelling deforestation.
Raw materials for industrial use
  • Forest provides raw material for industry and it has exerted tremendous pressure on forests. 
  • Increasing demand for plywood has exerted pressure on cutting of other species of trees such as fir to be used as packing material for apple in J&K and tea in northeast states.
Major effects of deforestation
Deforestation adversely affects and damages the environment and living beings 
Major causes of deforestation are
  • Soil erosion and loss of soil fertility
  • Decrease of rain fall due to affect of hydrological cycle
Effects of deforestation 
  • Expansion of deserts
  • Climate change and depletion of water table
  • Loss of biodiversity ,flora and fauna
  • Environmental changes and disturbance in forest ecosystems
Effects of Jhum cultivation
  • Jhum Agriculture or shifting agriculture has destroyed large number of hectare of forest tracts in North-Eastern states and Orissa. 
  • Jhum agriculture is subsidence agriculture in which tract of forest land is cleared by cutting trees and it is used for cultivation. After few years, when productivity of the land decreases, cultivators abandon the land and clear next tract. 
  • As a result of this practise, combined with increasing population there is rapid deforestation as more and more cultivators clear forest to cultivate land. 
  • Due to increase in population there is cultivators are forced to return to previous tracts of land in relatively shorter duration, thereby the land is not allowed to regain its productivity.
Chipko movement
The Chipko movement or Chipko Andolan is a social-ecological movement that practised the Gandhian methods of satyagraha and non-violent resistance, through the act of hugging trees to protect them from being felled. The modern Chipko movement started in the early 1970s in the Garhwal Himalayas of Uttarakhand,with growing awareness towards rapid 
deforestation. The landmark event in this struggle took place on March 26, 1974, when a group of peasant women in Reni village, Hemwalghati, in Chamoli district, Uttarakhand, 
India, acted to prevent the cutting of trees and reclaim their traditional forest rights that were threatened by the contractor system of the state Forest Department. Their 
actions inspired hundreds of such actions at the grassroots level throughout the region. By the 1980s the movement had spread throughout India and led to formulation of people-
sensitive forest policies, which put a stop to the open felling of trees in regions as far reaching as Vindhyas and the Western Ghats.

Forest resources are being over-utilised due the following reasons
Timber extraction
There has been unlimited exploitation of timber for commercial use. Due to increased industrial demand; timber extraction has significant effect on forest and tribal people.
Poor Logging
Poor logging results in degraded forest and may lead to soil erosion especially on slopes.
New logging roads permit shifting cultivators and fuel wood gatherers to gain access to the logging area.
Loss of long term forest productivity
Species of plants and animals may be eliminated due to unlawful or unscientific logging techniques
Exploitation of tribal people by contractor.

Major effects of mining operations on forest and tribal 
Effects of mining are listed hereunder:
  • Mining from shallow deposits is done by surface mining while that from deep deposits is done by sub-surface mining.
  • Mining leads to degradation of lands and loss of top soil. 
  • Almost eighty thousands hectare land is under stress of mining activities in India
  • Mining leads to drying up perennial sources of water sources like spring and streams in mountainous area.
  • Mining and other associated activities remove vegetation along with underlying soil mantle, which results in destruction of topography and landscape in the area. 
  • Large scale deforestation has been reported in Mussorie and Dehradun valley due to indiscriminating mining.
  • The forested area has declined at an average rate of 33% and the increase in non-forest area due to mining activities has resulted in relatively unstable zones leading to landslides.
  • Indiscriminate mining in forests of Goa since 1961 has destroyed more than 50000 ha of forest land. 
  • Coal mining in Jharia, Raniganj and Singrauli areas has caused extensive deforestation in Jharkhand.
  • Mining of magnetite and soapstone have destroyed 14 ha of forest in hilly slopes of Khirakot, Kosi valley and Almora.
  • Mining of radioactive minerals in Kerala, Tamilnadu and Karnataka are posing similar threats of deforestation.
  • The rich forests of Western Ghats are also facing the same threat due to mining projects for excavation of copper, chromites, bauxite and magnetite.

Ecological succession

ECOLOGIC SUCCESSION

  • Ecologic succcession is a natural process in which structure of a biologic community changes with time.
  • It is a very gradual process and imperceptible over short time scales
  • Nothing remains the same and habitats are constantly changing due to natural and anthropogenic (manmade or human induced) changes
  • It may also occur suddenly due to disasters (natural or man-made)
  • The structure of the new community is more complex than the previous community because of introduction of new species and consequently, newer interactions.
  • There are two types of succession - Primary or secondary
  • Primary succession refers to community changes that occur on an entirely new habitat which has never been colonized before.
  • Secondary succession refers to community changes that take place on a previously colonized, but disturbed habitat.
  • Succession takes place because through the processes of living, growing and reproducing. 
  • The organisms interact with and change the environment within an area, gradually.
  • The changed environment gives an advantage to newer species over the native living organisms as the newer species are better adapted to the changed environment
  • Succession involves the entire community
  • Change in the plant species present in an area is one of the driving forces behind ecological succession
  • The structure of the plant communities influences the animal species which can live in the microhabitats provided by the plants.
  • Succession is directional. Communities change gradually from one stage to another.

Types of ecological succession are:

  • Primary
  • Secondary and 
  • Cyclic
Succession continues finally ending up with a 'climax' community and stops there. 

Climax community is the final stage.

When large organisms in the climax community, new openings are created in which secondary succession will occur.

Thousands of different species might be involved in the community changes taking place over the course of a succession.

Factors controlling ecological succession are: 

  • the geology and history of the area, 
  • the climate, 
  • microclimate, 
  • weather, 
  • soil type and 
  • other environmental factors.

Succession occurs on many different timescales, ranging from a few days to hundreds of years.

Tuesday, March 30, 2021

Disaster Management and Methodology

 Here are few disaster management techniques that can be useful in reducing the damage caused:

  1. Prevention is better than cure. Disaster prevention is the first and foremost thing one can do. Be prepared according to the natural disasters that may occur according to the locality/area. Know the hazards in your area and know the risk. The information about natural hazards, their occurrence and effect should be known according to the location, region, etc. Geographical information systems (GIS) play a crucial role in this criterion.
  2. Social media is a great tool now-a-days, make use of it. Social network can help in communicating with those who are aware and can help you, before or during a disaster.
  3. Know about your nearby community officials and government servants who can help you and your neighbors in evacuating the place and also announce a ‘mandatory evacuation’ in the hazard prone area.
  4. Identify your nearest local media sources so that they provide valuable information and useful safety measures to people living in the area.
  5. Make sure you have a stock of first aid kit or a go-kit that helps you and your family during a disaster. If possible make sure you have stock pile of medication, food and enough water for at least 3 days during the disaster.
  6. In order to make sure you are not affected by the hazards, be in touch with any of your friends or relatives who stay far from you or from the disaster hit area. So that when you are evacuated, you are least affected in any terms.
  7. Raising your home, buying flood insurance, securing heavy furniture to the walls all are a part of mitigation, and these help in reducing or eliminating the impact caused by the disasters.
  8. Make sure you are adaptable to the environment or surrounding that you are evacuated to, so that no day of your work is missed out in case it takes long time for your previous area where you have lived to cope up from the disaster effect.
  9. Making use of Remote sensors in natural hazard assessments with the help of satellites or sensors mounted to aircrafts. They are very helpful in showing the evidences for occurrence and presence of the disasters according to the geographical, geological and hydrologic and natural phenomena.
  10. Public awareness is the most important one in disaster management. Development, planning and management will only be possible with the people being aware of the natural hazards and safety measures that are to be followed during or before a disaster. The study or knowledge on disaster management helps in taking good decisions regarding buying homes, building and living in hazard-prone areas.

Basic Principles of Disaster Mitigation

BASIC PRINCIPLES OF DISASTER MITIGATION

Mitigation is defined as “sustained action that reduces or eliminates long-term risk to people and property from natural hazards and their effects.” It describes the ongoing effort at the government and individual levels to lessen the impact of disasters on families, homes, communities and economy.

Disaster mitigation measures may be 

  • structural (e.g. flood dikes) or 
  • non-structural (e.g. land use zoning). 
Other examples of mitigation measures include: 

  • Hazard mapping
  • Adoption and enforcement of land use and zoning practices
There are three types of mitigation plans: 

  • Local
  • State and 
  • National
The term Mitigation can be considered as part of prevention. Mitigation means to reduce the severity of the human and material damage caused by the disaster. Prevention is to ensure that human action or natural phenomena do not result in disaster or emergency. 

The mitigation strategy is made up of three main components: 

  • mitigation goals
  • mitigation actions and an 
  • action plan for implementation
This provides the framework to identify, prioritize and implement actions to reduce risk to hazards. The four basic components of a risk assessment are:

  • Hazard identification
  • Profiling of hazard events
  • Inventory of assets and.
  • Estimation of potential human and economic losses based on the exposure and vulnerability of people, buildings, and infrastructure.

Disaster Preparedness needs to be followed by disaster mitigation, as it is essential for providing long-term relief to the victims of disasters. Disaster mitigation involves measures to reduce the effects of disaster-causing phenomena. Mitigation involves all actions to reduce the impact of a disaster that can be taken prior to its occurrence, including preparedness and long-term sisk reduction measures. It also includes the planning and implementation of measures to reduce the risks of human-made hazards, and the process of planning for effective response to disasters. Disaster mitigation includes scientific analysis of risk assessment, social, economic, legal and technical processes in the development of mitigation measures and administrative and political processes in the application of these measures. The most important part of implementing any mitigation program is an understanding of the nature of threat. For instance, in India, different states are vulnerable to different types of hazards. Some states are prone to foods and droughts, while some are prone to earthquake, falling in highly active seismic zone (zone IV or V), Most of the states are prone to a conbination of various hazards. Mitigation is required in all types of hazards. 

DISASTER MITIGATION: THE CONCEPT
Mitigation includes efforts or measures taken to reduce the adverse effects of disaster on people, livestock and physical structures. The aim of mitigation is to lessen the risks associated with disasters, through a combination of measures. The Government of India acts as the biggest insurer to help the population in distress due to any natilral calamity through relief and rehabilitation programmes, loans and subsidies. At this stage, a number of voluntaty agencies also come forward in
a big way to help mitigate tlie disastrous effects on the population. Contingency plans are normally available with the district administration and civil defence authorities for use after every minor or major disaster. A number of government departments and institutions are engaged in activities, which are multifaceted in nature. It is a team effort.

Sustainability is the key word in the developlnent process. The compounded costs of disasters relating to loss of life, assets, economic activities, and cost of reconstruction of not only assets but of lives can scarcely be borne by any commnunity or nation. Therefore, all development schemes in vulnerable areas should include disaster mitigation analysis, whereby the feasibility of any projet is assessed with respect to vulnerability of the area and the mitigation measures required For
sustainability. Environmental protection, afforestation programs, pollution control, construction of earthquake-resistant structures etc., should therefore be given high priority in the plans.

Thursday, March 25, 2021

Environment Protection Act

 ENVIRONMENT PROTECTION ACT

  • The Environment (Protection) Act, was passed in 1986 
    • It authorizes the central government to protect and improve environmental quality, control and reduce pollution from all sources
    • It prohibits the setting and /or operation of any industrial facility on environmental grounds.
    • It empowers the Central Government to establish authorities responsible for preventing environmental pollution in all its forms and to tackle specific environmental problems that are peculiar to different parts of the country. 
    • The Act was last amended in 1991.
  • The Environment (Protection) Rules lay down procedures for setting standards of emission or discharge of environmental pollutants.
Aside from the Air act and water act, this act acts as an umbrella covering all aspects of the environment