IMPACT OF MAN & TECHNOLOGY ON ENVIRONMENT. -
September 10th, 2010
IMPACT OF MAN & TECHNOLOGY ON ENVIRONMENT.
The history of man on earth begins with man using naturally occurring resources for his sustenance.
Hunting, fishing & the use of the products of natural vegetation like fruits were the resources available.
The eighteenth century saw the increasing use of technology in almost all human activities.
The industrial revolution raised the economic wealth of nations & those nations which took a headstart in industrialization came to be know as the developed nations.
Technology in land Development
Various earth-moving equipment have been used to level hills for highway construction & for railways.
Creation of artificial lakes, changing the direction of streams & rivers, building of dams across rivers can markedly change the topography of the land.
Sinking oil-wells in the oceans will remove more petroleum. There is also the danger of oil spills in the ocean waters which affect the marine environment.
Technology in Agricultural Development
Agricultural output has been increased world-wide by the use of mechanised farming for performing almost all farming procedures formerly done by human hands.
Soils are enriched by the use of fertilizers & pesticides. Improper & excessive use of pesticides leaves residues which are harmful. That is why many people now prefer to use agricultural produce obtained by organic farming
Technology in Water Improvement
Desalination of water: Sea water can be desalinated to give pure salt-free water either by distillation or ion exchange. Countries having scarcity of water can get their water supply by these methods.
Cleaning of rivers: Riverine waters get polluted by discharge of industrial effluents, which reduce the amount of dissolved oxygen.
Aeration of water, sedimentation of impurities by adding floculating agents & desilting improves the quality of water.
Technology in Improving Air Quality
Atmospheric air suffers in quality due to the discharge of fumes & volatile chemicals due to the presence of industries. The problem has become aggravated due to the demarcation of industrial estates.
The gases are passed through towers packed with chemicals to absorb them. Example, carbon dioxide can be absorbed by slaked lime- calcium hydroxide. Oxides of nitrogen can be catalytically oxidised.
Smoke sensor equipment detect presence of even small amounts of smoke, fumes & colorless, odourless & poisonous gases.