Current Affairs – April 18, 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.

Mooring Arrays: Fixed ocean instruments anchored at multiple depths and latitudes measure currents, temperature, salinity, and pressure.
Ocean Bottom Pressure: Measurement of pressure at the ocean floor, used to detect changes in large-scale ocean circulation with high accuracy.

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.

India’s AI Governance Guidelines

India AI Governance Guidelines were released during the AI Impact Summit 2026.
India has adopted a principle-based AI governance framework anchored in seven Sutras.
- Trust is the Foundation; People First; Innovation over Restraint; Fairness & Equity; Accountability; Understandable by Design; Safety, Resilience & Sustainability.
Objective: To ensure that AI is not concentrated in a handful of firms and AI development is aligned with the aspiration of Viksit Bharat 2047 and “AI for All”.

{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).

CDSCO, established under the Drugs and Cosmetics Act of 1940, regulates pharmaceuticals, medical devices, and cosmetics within the Ministry of Health and Family Welfare.

{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.

SAA is called the “Bermuda Triangle of Space” due to its reputation for causing satellite anomalies.

{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.