State of Global Water Resource Report 2023
Why in News: As reported in the State of Global Water Resources 2023, the year 2023 was the driest for global rivers in more than 30 years.

About the State of Global Water Resource Report
- PublicationThe report is published annually by the World Meteorological Organization (WMO) since 2021.It provides a comprehensive and consistent global assessment of water resources.
- Purpose: Data and Contributors The report is based on inputs from numerous National Meteorological and Hydrological Services, along with contributions from other organizations and experts.
Highlights of the 2023 Report
- Driest Year for Global Rivers: The year 2023 was the driest for global rivers in the last 33 years.
- Widespread Below-Normal River Conditions: The past five consecutive years have seen below-normal river flows, with reservoir inflows also following this trend.
- Glacier Ice Loss: In 2023, for the second consecutive year, all glacier-bearing regions reported ice loss, marking the largest mass loss recorded in 50 years.
- Over 600 gigatons (Gt) of water were lost across glaciated regions worldwide.
- Water Accessibility Concerns: Currently, 6 billion people face inadequate access to water for at least one month each year, a figure expected to rise to over 5 billion by 2050.
- Progress on Sustainable Development Goals (SDG): The world remains significantly off-track in achieving Sustainable Development Goal 6, which focuses on water and sanitation.
Vanuatu Islands
Why in News: A coalition of small Pacific islands, led by Vanuatu, asserts that climate change poses an existential peril to their territories.

About Vanuatu Islands
- Vanuatu, officially known as the Republic of Vanuatu, stands as a Melanesian island nation situated in the South Pacific Ocean.
- Port Vila serves as the capital of the Republic of Vanuatu.
- The country comprises a Y-shaped archipelago consisting of 83 islands and lies northeast of Australia.
Ecological Features:
- Vanuatu is distinguished by its unique terrestrial ecoregion called the Vanuatu rain forests.
- It falls within the Australasia Ecozone, showcasing a diverse array of flora and fauna.
Climate Change Threat:
- Vanuatu faces an existential threat that affects livelihoods, security, and overall well-being due to climate change.
- The country experiences sea level rise at a rate twice as fast as the global average, with projections indicating further increases throughout the 21st century.
Holography
Why in News: Spain’s Alicia Framis, is all set to become the first woman to tie the knot with an AI-generated hologram, named AILex.

About Holography:
- Holography is a technique employed in optics and imaging that records and reconstructs a wavefront, commonly utilized to generate three-dimensional images.
- Holography is a method for generating three-dimensional images known as holograms.
Process:
- This process involves capturing comprehensive three-dimensional data of an object, encompassing depth, perspective, and parallax, utilizing laser light to create an interference pattern on a photosensitive medium.
- It employs laser beams, exploits interference and diffraction properties, records light intensity, and utilizes illuminated recordings.
- Dennis Gabor, a Hungarian-British physicist, received the Nobel Prize in Physics in 1971 for inventing and advancing the holographic technique.
- Holographic images exhibit a distinctive quality: they dynamically change based on the observer’s relative position, simulating the presence of depicted objects.
Holograms:
- Holograms, on the other hand, are recordings of interference patterns capable of reproducing a three-dimensional light field through diffraction.
Representation:
- They represent the resulting three-dimensional images produced by the holographic process, appearing as if suspended in space and viewable from various angles without requiring specialized glasses or equipment.
Tsirkon Hypersonic Missile
Why in News: Russia used the Tsirkon hypersonic missile for the first time in a recent strike, Ukraine claims.

About Hypersonic Technology Unveiled
Hypersonic technology involves the development of vehicles capable of achieving speeds five times or more greater than the speed of sound, often denoted by the Mach number.
- Mach Numbers: Mach number is a measure comparing an aircraft’s velocity to the speed of sound in air. Mach 1 corresponds to the speed of sound, which is approximately 343 meters per second.
- Technology: The cornerstone technology behind most hypersonic vehicles is scramjet propulsion, a type of air-breathing propulsion system.
Varieties of Hypersonic Systems
- Hypersonic Cruise Missiles: Hypersonic cruise missiles utilize either rocket or jet propellant throughout their flight trajectory. They are often perceived as enhanced versions of conventional cruise missiles, distinguished primarily by their remarkable speed.
- Hypersonic Glide Vehicle (HGV): HGVs follow a distinct launch approach: they ascend into the atmosphere atop conventional rockets before redirecting towards their intended target. This deployment method offers unique advantages in terms of trajectory and maneuverability.