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IASbhai Current Affairs News Analysis | Prelims & Mains 2020-21 is an initiative to dilute major articles from leading Newspapers in India which are most relevant to UPSC preparation –‘THE HINDU, LIVEMINT , INDIAN EXPRESS’ and help millions of readers who find difficulty in answer writing and making notes everyday. Hence we choose articles on daily basis and analyse them with respect to UPSC PRELIMS 2021.

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Current Affairs News Analysis for UPSC | 9th Jan 2021

American rivers has changed colour


One in three large American rivers has changed colour in the last 34 years: Study

      WHY IN NEWS:

One-third of rivers in the United States have changed colour in the last three-and-a-half decades, a study published recently in the journal Geophysical Research Letters has shown.



Most rivers in the United States appear green or yellow possibly due to human activities

  • They have changed from appearing blue to appearing yellow and green, indicating the presence of sediments and algae, likely caused by anthropogenic activities.
  • The study analysed nearly 235,000 satellite images covering 67,000 miles of large rivers taken from 1984 to 2018 by NASA and the US Geological Survey.


  • Fifty-six per cent of rivers appeared yellow instead of blue and 38 per cent appeared green.
  • In one-third of the rivers studied, the change in colour from blue to green or yellow was a long-term change, not tied to seasonal variation.
  • The yellow colour usually appears due to high levels of sediment in the water.
  • Sedimentation can be caused by human activities like dredging or construction or natural causes like heavy rainfall.

Current Affairs News Analysis for UPSC | 9th Jan 2021

A map made by the Gardner Hydrology Lab, University of Pittsburgh, showing the colours of rivers in the US

The green colour appears when there are large amounts of algae due to fertiliser runoff from farms

  • Just eight per cent of the satellite images showed rivers as blue.

      IASbhai WINDUP: 

  • The United States has over 250,000 rivers, with a total of about 3,500,000 miles of rivers.

The longest river in the US is the Missouri river, a tributary of the Mississippi river and is 2,540 miles long

  • But the biggest in terms of water volume is the deeper Mississippi river.
     SOURCES:  DownToEarth  | Current Affairs News Analysis for UPSC | 9th Jan 2021

Mollusc species


Mollusc species collapsing in eastern Mediterranean, finds study

      WHY IN NEWS:

The study was published in the Proceedings of the Royal Society B: Biological Sciences and published January 6, 2021.

SYLLABUS COVERED: GS 3: Conservation of flora and fauna


Marine molluscs — that comprise several marine species — have collapsed in parts of the eastern Mediterranean due to rising temperature of water.


  • As water turns warmer due to global warming, marine organisms that cannot adapt to changing temperature migrate to cooler water areas or die.

The research team quantified local extinction for marine molluscs, such as snails and mussels

Current Affairs News Analysis for UPSC | 9th Jan 2021

Current Affairs News Analysis


  • They surveyed the Israeli shelves in the eastern Mediterranean, which is one of the warmest areas in the Mediterranean Sea.

It has experienced a temperature increase of approximately 3 degrees Celsius between 1980 and 2013

  • It records an average temperature of 32 degrees Celsius in the summer.
  • Only around 12 per cent of the shallow-sediment molluscs noted in the historical records are still present today.
  • On rocky reefs, that number is only five per cent.

      IASbhai WINDUP: 

  • While the mollusc species originally native to the eastern Mediterranean are on the decline, tropical invaders have increased significantly.
  • There are several other factors contributing to the collapse of the species, most notably pollution and the pressures from invasive species.
     SOURCES:   DownToEarth  | Current Affairs News Analysis for UPSC | 9th Jan 2021



Over half of Army personnel under severe stress, says study

      WHY IN NEWS:

This is according to the findings of a study by United Service Institution of India (USI), a Service think tank.



Prolonged counter-terrorism duty is cited as one of the reasons for increased stress levels.


  • More than half of Indian Army personnel seem to be under severe stress.
  • There has been a significant increase in stress levels amongst Indian Army personnel during approximately last two decades due to operational and non-operational stressors.
  • Officers experience comparatively much higher cumulative stress levels, compared to the Junior Commissioned Officers (JCO) and Other Ranks (OR) and the stress causative factors are also different.

      IASbhai WINDUP: 

  • The study observes that the overall job satisfaction and pride in uniform remains high amongst JCOs and ORs.
  • Despite harsh and challenging service conditions, Indian Army personnel remain highly motivated to serve in CI/ CT areas voluntarily.
     SOURCES:  THE HINDU  | Current Affairs News Analysis for UPSC | 9th Jan 2021

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