UGC NTA NET Exam Preparation |Causes of Climate Changes| Unit-9|Part-6|

UGC NTA NET Exam Preparation |Causes of Climate Changes| Unit-9|Part-6|

Climate Change: climate change is a long term shift in weather conditions identified by climate factors such as temperature, precipitation winds, and other factors.

Climate change can involve both changes in average condition and changes in variability natural events and human activities are believed to be contributing to climate change.

Causes of Climate Change: The causes for climate change are many. they can be grouped into natural causes and man-made causes.

Natural Causes of Climate Change

  • Sunspots: Sunspots are storm on the sun's surface that are marked by intense magnetic activity, solar flares and hot gassy ejection from the sun's corona. it is seen that with increase in sunspot activity the sun glows brighter by about 0.1% now than it did 100 years ago. Thus, many scientists believe that it may be one of the cause of rise of global temperature which affects the climate change.
  • Milankovitch: Milankovitch then describes the collective effects of changes in the earth's movement upon its climate, named after Serbian geophysicist and astronomer Milatin Milanleovic, who had theorised the variations in eccentricity, axial, tilt, and procession of the Earth's orbit determine climate patterns on the earth. 
  • Volcanic Activity: The dust,gases and other particles erupted during the volcanic activities, reduces the amount of sunrays coming into the earth. for e.g. Mount Pinatubo erupted, it reduced the amount of solar radiations reaching the Earth's surface, lowering temperatures in the troposphere and changing atmospheric circulation patterns.

Man-Made Causes of Climate Change

  • Forest Destruction: forests have a vital role to play in to fight against global warming. carbon is absorbed by forests and stored in the trees and soil. this carbon is released as carbon dioxide and other greenhouse gases when forests are disturbed or cleared.
  • Agricultural Activities: Including all the manufacture and use of pesticides and fertilizers, feral, oil farm tractors, equipment, trucking and shipping electricity for lighting, cooling and emission of green house gases increase carbon footprints.
  • Fossil Fuel: Burning the carbon based fuel that converts carbon to carbon dioxide, this carbon dioxide is usually released to the atmosphere. this leads to increased concentration of CO2 in the atmosphere.
  • Urbanisation and Industrialisation: The excessive exploitation of resources and nature due to rapid urbanisation and industrialisation led to climate change. 


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