About Sathyamangalam Tiger Reserve:

• Location: It is located in Tamil Nadu.
• It is nestled at the junction of the Eastern and the Western Ghats in the Nilgiri Biosphere Reserve
• It is contiguous with the Mudumalai Tiger Reserve, Bandipur Tiger Reserve (Karnataka), and BR Tiger Reserve and Wildlife Sanctuary (Karnataka).
• Terrain: The terrain is hilly and undulating with altitude ranging between 750 m and 1649 m.
• Climate: It is subtropical and dry.
  • The summers are hot and dry; the monsoons are wet and cooler, with river flooding.
• Rivers: Some of the prominent rivers in the region include the Bhavani, Moyar, and Noyyal rivers.
• Tribal Communities: It is home to several indigenous tribal communities, including the Irula and Kurumba tribes.
• Vegetation: It consists of southern tropical dry thorn forests, mixed deciduous forests, semi-evergreen forests, and riparian forests.
• Flora: It includes teak, sandalwood, bamboo, Terminalia, and Albizia, alongside medicinal plants and shrubs that support both wildlife and local communities.
• Fauna: The major species are Elephant, Tiger, Panther, Sloth bear, Gaur, Black Buck, Spotted deer, Wild boar, Black napped hare, Common langur Nilgiri langur, Striped neck mongoose, and Bonnet macaque.

About Methane:

• Methane is a potent greenhouse gas, responsible for about 30% of the global temperature rise since the Industrial Revolution.
• Its atmospheric concentration is now 2.5 times higher than in the preindustrial era and is rising faster than other greenhouse gases.
• It is the primary component of natural gas and a byproduct of fossil fuel exploration.
• It is 86 times more efficient at trapping heat over a 20-year-period than carbon dioxide.
• Major Sources: The three major anthropogenic sources of methane emissions are  agriculture, energy, and waste sectors.
• Methane Characteristics:
  • It is a colourless, odourless, and highly flammable gas, also known as marsh gas.
  • Although it remains in the atmosphere for a shorter period — about 12 years — than carbon dioxide,
  • It traps far more heat in the near term, making it a key driver of short-term climate change, contributing 28 times more to global warming than carbon dioxide for every tonne.

About Legionnaire's Disease:

• It is a severe form of a lung infection (pneumonia) caused by a bacterium known as legionella.
• The disease got its name when a group of people at an American Legion convention became ill with this type of pneumonia in 1976.
• Legionnaires’ Disease Transmission
  • Legionella is found naturally in freshwater, such as lakes and rivers. It can also be found in soil. 
  • Most people who catch Legionnaires’ disease breathe in the bacteria from water or soil. 
  • One can’t get infected by drinking water that contains the bacteria unless you aspirate it (accidentally breathe the water into your lungs).
  • It is not contagious, meaning it is not spread from person to person.
• Risk: Older adults, people with weakened immune systems, and people who smoke have a higher risk of getting Legionnaires’ disease.
• Symptoms:
  • It causes pneumonia-like symptoms that start two to 14 days after exposure to Legionella. 
  • Patients usually present with fever, cough, shortness of breath, tiredness, headache, muscle pain, and may have gastrointestinal symptoms such as abdominal pain and diarrhoea. 
  • In severe cases, neurological symptoms (e.g., confusion) and respiratory failure may occur, and some cases may result in death.
• Treatment:
  • It can be treated with antibiotics.
  • But some people still have problems after treatment.
  • Currently, there is no vaccine available for LD

About South Shetland Island:

• Location: The South Shetland Islands are a remote archipelago located about 120 kilometers (75 miles) north of the Antarctic Peninsula.
• The South Shetland Islands are often called the jewel in Antarctica’s crown.
• It was first discovered in 1819 by British mariner William Smith
• Formation: The islands were formed by volcanic activity, and some of the islands are still active today.
• The most well-known is Deception Island, which has a large, flooded caldera.
• More than 80% of the land area is covered by permanent ice.
• There are no permanent residents on this island. Some countries maintain small teams at research stations, depending on the season.
• Fauna
  • Birds: Gentoo, Chinstrap, Adélie and even a couple of Macaroni Penguins breed on the islands.
  • Mammals: The marine mammals consist of species such as Crabeater Seal, Leopard Seal, Weddell Seal, Fin Whale, Humpback Whale, and the Southern Right Whale.

About Hypercapnic Hypoxia in Mangroves:

• Hypercapnic Hypoxia is a high CO₂ and low oxygen state.
• It pushes estuaries into a stressful chemical state.
• It mostly occurs during low tide, at low-salinity sites and in warm tropical regions.
• Causes: Rising Co2 level due to climate change and Temperature Increase
• Impact Hypercapnic Hypoxia on Biodiversity
  • It threatens fish nurseries in mangrove ecosystems
  • It reduces biodiversity and habitat quality for fish
  • Impacts fisheries and livelihoods of millions
  • It shifts mangrove species composition away from large reef-associated species.

What are Mangroves?

• Mangroves are salt-tolerant trees and shrubs that grow in coastal intertidal zones, primarily in tropical and subtropical regions.
• These unique ecosystems thrive in saline or brackish waters, withstanding harsh environmental conditions such as tidal fluctuations, high salinity, and low oxygen levels in the soil.
• Mangrove forests act as a crucial buffer between land and sea, providing habitat for various marine and terrestrial species.

About World Happiness Report:

• It is the world’s foremost publication on global wellbeing and how to improve it.
• Published by: It is an annual report published by the University of Oxford’s Wellbeing Research Centre in partnership with Gallup, the UN Sustainable Development Solutions Network
• It asks people to rate their life on a 0-10 scale, from the worst possible life (0) to the best possible life (10).
• Country rankings were based on answers given by around 100,000 people in 140 countries and territories who were asked to rate their own lives. 
• Factors for evaluation of happiness ranking
  • GDP per capita
  • Life expectancy
  • Social support
  • Freedom to make life choices
  • Generosity
  • Perceptions of corruption

Highlights of World Happiness Report 2026:

• Top 5 Happiest Countries: Finland, Iceland, Denmark, Costa Rica, Sweden.
• Unhappy Countries: Afghanistan, Sierra Leone, Malawi, Zimbabwe
• India improved its ranking from 126th in 2024 to 118th in 2025.

About Adipose Tissue:

• Adipose tissue, otherwise known as body fat, is a connective tissue that extends throughout body.
• It's found under skin (subcutaneous fat), between internal organs (visceral fat) and even in the inner cavities of bones (bone marrow adipose tissue).
• Types of Adipose Tissue:
  • White adipose tissue
  • It is the most abundant type of fat in adults, does store energy in the form of triglycerides.
  • Functions:
    • It releases hormones like leptin that reduce appetite, as well as adiponectin, which regulates insulin and blood sugar levels.
    • It also cushions organs, insulates against heat loss and acts as a metabolic buffer, safely storing excess lipids.
    • They contribute to insulin resistance, fatty liver disease and cardiovascular risk.
  • Brown adipose tissue (Fat)
    • It is specialized to burn energy.
    • Brown adipose cells are packed with mitochondria and contain a protein called UCP1 that allows them to convert chemical energy directly into heat.
  • Beige fat cells:
    • These cells arise within white fat depots under certain conditions – such as cold exposure or specific hormonal signals.
    • They acquire some of the heat-producing properties of brown fat.