Current Affairs – April 19, 2026

{GS1 – Geo} Weakening of the Atlantic Meridional Overturning Circulation

• Context (DTE): Recent studies have warned that the Atlantic Meridional Overturning Circulation (AMOC) is declining and may be approaching an irreversible tipping point.

Atlantic Meridional Overturning Circulation

• AMOC is a large-scale ocean circulation system in the Atlantic Ocean, moving warm surface water northward and cold deep water southward.
• Conveyor System: Functions as a global ocean conveyor belt, redistributing heat between the equator and the poles.
• Density Driven: Controlled by temperature (thermo) and salinity (haline) differences, it is a thermohaline circulation.

Mechanism:

• Surface Flow: AMOC carries warm, saline surface water from the tropics to the North Atlantic/Arctic.
• Deep Water Formation: Cooling and increased salinity make water dense, causing it to sink in the North Atlantic (downwelling).
• Return Circulation: Cold, dense water flows southward at depth toward the tropics, completing the global overturning loop.

• Climate Role: Acts as a major regulator of global climate and weather patterns; keeps Northern Europe and North America warmer.

Evidence of Weakening of AMOC

• Observed Decline: The AMOC has shown consistent weakening over the past two decades, based on observational data.
• Mooring Evidence: Measurements from mooring arrays indicate a steady decline in overturning strength.
• Western Boundary: Up to 90% of total weakening linked to western boundary circulation changes.
• OBP Data: Ocean Bottom Pressure data provide high-accuracy evidence of large circulation changes.

Causes of AMOC Weakening

• GHG Rise: AMOC weakens due to increasing GHG concentrations & rising global temperatures.
• Freshwater Input: Melting Greenland Ice Sheet adds freshwater to the North Atlantic, disrupting circulation dynamics.
• Salinity Reduction: Freshwater influx lowers ocean salinity & density, weakening deep-water formation.

Possible Impacts of AMOC Collapse

• CO₂ Release: AMOC collapse could release 47–83 gigatonnes of CO₂ into the atmosphere.
• Carbon Sink Shift: The Southern Ocean may shift from a carbon sink to a carbon source due to the upwelling of carbon-rich waters.
• Global Warming: Additional CO₂ may contribute to a ~0.2°C rise in global temperatures.
• Arctic Cooling: Northern regions may experience ~7°C cooling due to reduced heat transport.
• Antarctic Warming: Southern regions may warm by ~6°C (up to 10°C locally).
• Polar Contrast: Sharp temperature difference between the Northern & Southern Hemispheres.
• Sea-Ice Feedback: Increased Arctic ice raises albedo, amplifying cooling (positive feedback loop).

{GS2 – MEITY} AI Governance and Economic Group **

• Context (PIB): The Government has constituted the AI Governance and Economic Group under the Ministry of Electronics and Information Technology (MeitY).

About AI Governance and Economic Group (AIGEG)

• The AIGEG is a high-level inter-ministerial body which will operate as the apex body within India’s AI governance framework.
• Whole-of-Government Approach: It will ensure alignment among ministries, regulators, and institutions to build a coherent national AI governance framework.
• Focus: Aims to balance innovation, safety, accountability, and ethical AI deployment across sectors.
• Composition: It brings together expertise from the domains of technology, economics, public policy, and national security.
  • Chairperson: Minister of Electronics & Information Technology
  • Vice-Chairperson: Minister of State for Electronics & Information Technology
• Advisory Support: Assisted by the Technology and Policy Expert Committee (TPEC) for inputs on global trends, risks, and regulatory needs.

{GS2 – Governance} Rise in Patent Filings in India **

• Context (TOI): India’s patent filings increased by 30.2% to 1.43 lakh in FY 2025–26, reflecting the rapid expansion of the innovation ecosystem.

Patent Ecosystem in India

• Domestic Contribution: Over 69% of patent applications were filed domestically, indicating rising indigenous innovation capacity.
• Global Ranking: India has emerged as the world’s sixth-largest patent filer.
• State-wise Ranking: States like Tamil Nadu, Karnataka, and Maharashtra lead in patent filings.
• Government Initiatives: Policy measures include reduced fees, expedited examination, and support for startups, MSMEs, and academic institutions.
• Ease of Filing: Pro bono facilitation schemes assist startups in filing patents, trademarks, and design applications.
• Significance: Rising patent filings reflect India’s transition towards a knowledge-based economy driven by innovation and R&D.

More About Patents

• A patent is an intellectual property right granted to an inventor to exclusively use, make, & sell an invention for a specified period.
• Legal Basis: In India, patents are governed by the Patents Act, 1970.
• Objective: Patents aim to promote innovation by rewarding inventors while encouraging disclosure of new technologies.
• Criteria: An invention must be novel, involve an inventive step, and be industrially applicable to qualify for a patent.
• Duration: A patent is generally granted for 20 years from the date of filing.
• Exclusive Rights: The patent holder can prevent others from making, using, selling, or importing the invention without permission.
• Types: Includes product patents and process patents, depending on the nature of the invention.
• Opposition Mechanism: The Act allows pre-grant opposition by any person and post-grant opposition by interested parties to ensure patent quality.

{GS3 – Envi} IUCN Reclassified Emperor Penguins and Antarctic Fur Seals as Endangered

• Context (DTE): The IUCN has reclassified both emperor penguins and Antarctic fur seals as Endangered on its Red List of Threatened Species.

• Emperor penguins were uplisted from “Near Threatened” to Endangered due to rapid population declines and premature sea-ice break-up.
• Antarctic fur seals jumped multiple categories from “Least Concern” directly to Endangered, driven by food scarcity from warming oceans.

Emperor penguin (Aptenodytes forsteri)

• Emperor penguin is the largest and heaviest of all living penguin species.
• Cold Adaptation: It has the highest feather density of any bird and a thick layer of subdermal fat (blubber) for insulation.
• Appearance: They have a black head and back, a white belly, and distinctive bright yellow-to-orange patches on their ears and upper breast.
• Diving Record: As the world’s deepest-diving birds, Emperor penguins can reach depths of over 550 metres and remain submerged for more than 30 minutes.
• Winter Breeding: It is the only bird species that breeds during the Antarctic winter, with males incubating a single egg on their feet for two months without eating.
• Habitat: They are true polar birds that live almost exclusively on stable sea ice (fast ice) and ice shelves.
• Distribution: Emperor penguins are endemic to Antarctica, with colonies distributed between 66° and 78° South latitude.
• Huddling: To survive extreme cold, thousands of birds pack together in a coordinated huddle, taking turns moving to the warm centre.
• Key Threats: Climate change, commercial overfishing, oil spills, and avian influenza.
• Conservation Status: IUCN: Endangered

Antarctic fur seal (Arctocephalus gazella)

• Antarctic fur seal is a marine mammal of the eared seal family, Otariidae.
• Dimorphism: They exhibit extreme sexual dimorphism; dark brown males are up to five times larger than greyish-brown females.
• Rare Coat: One in every 1,000 Antarctic fur seals is born with a blonde or creamy-white leucistic coat.
• Habitat: The seals prefer rocky beaches and lush tussock grass of sub-Antarctic islands.
• Distribution: While they forage across the Southern Ocean, the majority of their breeding population is concentrated on South Georgia Island.
• Diet: Antarctic krill makes up about 95% of their diet.
• Territoriality: Males are territorial “beachmasters” who arrive early in the breeding season to establish territories through vocalisations and fighting.
• Ecological Role: Antarctic fur seals serve as a vital indicator species for the health of the Southern Ocean’s marine ecosystem.
• Key Threats: Ocean warming, shifting sea-ice patterns, and the decline of Antarctic krill populations.
• Conservation Status: IUCN: Endangered; CITES: Appendix II
• Hunting: They were hunted nearly to extinction in the 18^th & 19^th centuries for their pelts.

{Prelims – S&T} New Memristors for Energy-Efficient AI *

• Context (TH): Cambridge researchers developed a stable hafnium-oxide memristor that may reduce AI energy consumption.

• Memristors are electronic devices that regulate current flow while remembering past charge flow.
• They are the fourth fundamental circuit element alongside the resistor, capacitor, and inductor.
• Hafnium-oxide memristors mimic biological synapses, in which storage and processing occur within the same local unit.
• This reduces the Von Neumann bottleneck, in which AI systems waste energy transferring data between separate memory and processing units.
• Key Feature: These are non-volatile components that retain data when power is removed, making them ideal for instant-on storage systems.
• Key Applications: They support brain-like computing, compact memory, smart IoT devices, aerospace electronics, health wearables, and secure hardware systems.
• Significance: They can boost AI and Machine Learning (ML) and reduce AI energy use by up to 70%.

{Prelims – S&T} Generic Oral Semaglutide Approved in India *

• Context (ET): Dr. Reddy’s Laboratories received approval from the Central Drugs Standard Control Organisation (CDSCO) to manufacture and market generic oral semaglutide tablets.

• Semaglutide is an anti-diabetic and anti-obesity medication used to treat Type 2 diabetes, manage weight, and reduce cardiovascular risk.
• Classification: It belongs to the GLP-1 receptor agonist class used for metabolic disease management.
• Mechanism: It mimics Glucagon-Like Peptide-1 (GLP-1), a hormone that enhances insulin secretion, delays gastric emptying, and suppresses appetite.
• Significance: Generic availability aids India’s battle against rising Non-Communicable Diseases (NCDs).

{Prelims – S&T} South Atlantic Anomaly

• Context (Byte): The South Atlantic Anomaly (SAA) is actively splitting into two distinct zones, adding a new layer of complexity for satellites in low Earth orbit.

• The SAA is a weak spot in Earth’s magnetic field located above the South Atlantic Ocean, stretching between South America and southern Africa.
• Magnetic Weakness: Reduced magnetic intensity in this region allows high-energy charged particles from space to penetrate closer to Earth.
• Radiation Exposure: Satellites passing through the SAA experience increased radiation levels, leading to a higher risk of system glitches and hardware damage.
• Scientific Monitoring: Missions like the European Space Agency’s Swarm are continuously tracking changes in Earth’s magnetic field and the anomaly’s evolution.

{Prelims – In News} National Cadet Corps (NCC)

• Context (DDN): National Cadet Corps (NCC) launched a nationwide Cyber Security Capacity Building Programme with the National Institute of Electronics and Information Technology (NIELIT).

• The initiative aims to build ‘Cyber Cadets’ to counter modern digital threats, supporting Digital India and the National Skills Qualification Framework (NSQF).
• NCC is a voluntary Tri-Services organisation (Army, Navy & Air Force) under the Ministry of Defence.
• It was established under the NCC Act, 1948, based on the recommendation of the H. N. Kunzru Committee. It is now the world’s largest uniformed youth organisation.
• Motto: “Unity and Discipline” emphasises the NCC’s focus on building character, leadership, patriotism, and selfless service among young people.
• Structure: NCC is headed by a Director General and is headquartered in New Delhi.

{Prelims – PIN World – Asia} Scarborough Shoal *

• Context (RE): China has recently escalated maritime tensions by deploying floating barriers and naval vessels to blockade the disputed Scarborough Shoal.

• Scarborough Shoal is a triangular, strategically significant coral atoll and a traditionally rich fishing ground in the South China Sea.
• It lies about 120 nautical miles west of the Philippine island of Luzon and about 470 nautical miles from China’s coast.
• It is called Huangyan Island by Beijing and Panatag Shoal or Bajo de Masinloc by Manila, and remains a flashpoint over sovereignty and fishing access.
• Key Dispute: The Philippines claims the shoal within its 200-nautical-mile Exclusive Economic Zone (EEZ) under UNCLOS, while China asserts it through the Nine-Dash Line.
• Legal Ruling: The 2016 Permanent Court of Arbitration rejected China’s maritime claims and ruled its blockade unlawful under international law.

Read More > Scarborough Shoal | South China Sea Dispute