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Dear Aspirants,

This Spotlight is a part of our Mission Nikaalo Prelims-2023.

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16th May 2023

Climate Change, Pollution

What is Climate Change?

The periodic modification of Earth’s climate brought about due to the changes in the atmosphere as well as the interactions between the atmosphere and various other geological, chemical, biological and geographical factors within the Earth’s system is called Climate change.

Factors Affecting Climate Change

Natural Factors – affect the climate over a period of thousands to millions of years.Such as – 

1. Continental Drift – have formed millions of years ago when the landmass began to drift apart due to plate displacement. This impacts climate change due to the change in the landmass’s physical features and position and the change in water bodies’ position like the change in the follow of ocean currents and winds.
2. Volcanism – Volcanic eruption emits gasses and dust particles that last for a longer period causing a partial block of the Sun rays thus leading to cooling of weathers and influencing weather patterns.
3. Changes in Earth’s Orbit – A slight change in the Earth’s orbit has an impact on the sunlight’s seasonal distribution reaching earth’s surface across the world. There are three types of orbital variations – variations in Earth’s eccentricity, variations in the tilt angle of the Earth’s axis of rotation and precession of Earth’s axis. These together can cause Milankovitch cycles, which have a huge impact on climate and are well-known for their connection to the glacial and interglacial periods.

Anthropogenic Factors – is mainly a human-caused increase in global surface temperature. Such as –

1. Greenhouse Gasses – these absorb heat radiation from the sun resulting in an increase in Global Temperature. GHGs mostly do not absorb solar radiation but absorb most of the infrared emitted by the Earth’s surface. Global warming begins with the greenhouse effect, which is caused by the interaction between incoming radiation from the sun and the atmosphere of Earth.
2. Atmospheric Aerosols – these can scatter and absorb solar and infrared radiation. Solar radiation scatters and cools the planet whereas aerosols on absorbing solar radiation increase the temperature of the air instead of allowing the sunlight to be absorbed by the Earth’s surface. Aerosols have a direct affect on climate change on absorption and reflection of solar radiation. Indirectly it can affect by modifying clouds formation and properties. It can even be transported thousands of kilometres away through winds and circulations in the atmosphere.
3. Shift in land-use pattern – Most of the forests and land covers are replaced by agricultural cropping, land grazing, or for Industrial or commercial usage. The clearing of forest cover increases solar energy absorption and the amount of moisture evaporated into the atmosphere.
   • The lower the albedo (reflectivity of an object in space), the more of the Sun’s radiation gets absorbed by the planet and the temperatures will rise. If the albedo is higher and the Earth is more reflective, more of the radiation is returned to space, leading to the cooling of the planet.

Potential Effects of climate change in India

• Extreme Heat: India is already experiencing a warming climate. Unusual and unprecedented spells of hot weather are expected to occur far more frequently and cover much larger areas. Under 4°C warming, the west coast and southern India are projected to shift to new, high-temperature climatic regimes with significant impacts on agriculture.
• Changing Rainfall Patterns: A decline in monsson rainfall since the 1950s has already been observed. A 2°C rise in the world’s average temperatures will make India’s summer monsoon highly unpredictable. At 4°C warming, an extremely wet monsoon that currently has a chance of occurring only once in 100 years is projected to occur every 10 years by the end of the century. Dry years are expected to be drier and wet years wetter.
• Droughts: Evidence indicates that parts of South Asia have become drier since the 1970s with an increase in the number of droughts. Droughts have major consequences. In 1987 and 2002-2003, droughts affected more than half of India’s crop area and led to a huge fall in crop production. Droughts are expected to be more frequent in some areas, especially in north-western India, Jharkhand, Orissa, and Chhattisgarh. Crop yields are expected to fall significantly because of extreme heat by the 2040s.
• Groundwater: Even without climate change, 15% of India’s groundwater resources are overexploited. Falling water tables can be expected to reduce further on account of increasing demand for water from a growing population, more affluent lifestyles, as well as from the services sector and industry.
• Glacier Melt: Most Himalayan glaciers have been retreating over the past century. At 2.5°C warming, melting glaciers and the loss of snow cover over the Himalayas are expected to threaten the stability and reliability of northern India’s primarily glacier-fed rivers. Alterations in the flows of the Indus, Ganges, and Brahmaputra rivers could significantly impact irrigation, affecting the amount of food that can be produced in their basins as well as the livelihoods of millions of people
• Sea level rise: With India close to the equator, the sub-continent would see much higher rises in sea levels than higher latitudes. Sea-level rise and storm surges would lead to saltwater intrusion in the coastal areas, impacting agriculture, degrading groundwater quality, contaminating drinking water, and possibly causing a rise in diarrhoea cases and cholera outbreaks, as the cholera bacterium survives longer in saline water. Kolkata and Mumbai, both densely populated cities, are particularly vulnerable to the impacts of sea-level rise, tropical cyclones, and riverine flooding.
• Apart from this food and energy security are also major concerns. Water scarcity, health hazards among the masses, and migration and political conflicts are expected to grow.

India’s response to Climate Change

• National Action Plan on Climate Change (NAPCC): outlines existing and future policies and programs addressing climate mitigation and adaptation. The Action Plan identifies eight core “national missions” running through to 2017: Solar Energy; Enhanced Energy Efficiency; Sustainable Habitat; Water; Sustaining the Himalayan Ecosystem; Green India; Sustainable Agriculture; and Strategic Knowledge for Climate Change. Most of these missions have strong adaptation imperatives.
• National Clean Energy Fund: The Government of India created the National Clean Energy Fund (NCEF) in 2010 for financing and promoting clean energy initiatives and funding research in the area of clean energy in the country. The corpus of the fund is built by levying a cess of INR 50 (subsequently increased to INR 100 in 2014) per tonne of coal produced domestically or imported.
• Paris Agreement: Under the Paris Agreement, India has made three commitments. India’s greenhouse gas emission intensity of its GDP will be reduced by 33-35% below 2005 levels by 2030. Alongside, 40% of India’s power capacity would be based on non-fossil fuel sources. At the same time, India will create an additional ‘carbon sink’ of 2.5 to 3 billion tonnes of Co2 equivalent through additional forest and tree cover by 2030.
• International Solar Alliance: ISA was launched in Paris on 30 November 2015 by India and France, in the presence of Mr. Ban Ki Moon, former Secretary-General of the United Nations.
• Bharat Stage (BS) Emission Norms: Emissions from vehicles are one of the top contributors to air pollution, which led the government at the time to introduce the BS 2000 (Bharat Stage 1) vehicle emission norms from April 2000, followed by BS-II in 2005. BS-III was implemented nationwide in 2010. However, in 2016, the government decided to meet the global best practices and leapfrog to BS-VI norms by skipping BS V altogether.

All these efforts need to be implemented well to mitigate the effects of climate change.

How can India cope with climate change effects?

An ‘adaptation’ approach is the way to go. For this, a big push must be given to the interlinking of rivers and the use of GM crops. Climate action has globally been ‘mitigation-centric’ — most of the programs (such as a push for renewable energy and electric vehicles) are aimed at slowing down future global warming. ‘Mitigation’ is more important to developed countries, but for countries like India, the focus should be on ‘adaptation’, or measures are taken to cope with the inevitable effects of climate change that has already happened, such as nasty storms, floods, and droughts.

‘Adaptation’ is like protecting yourself against a punch that will land. India has also been mitigation-centric; it is time to bring focus on ‘adaptation’. And for adaptation, the time has come for two major steps.

• The first is to give a big push to a 150-year-old idea — inter-linking of rivers (ILRs). With floods and droughts likely to occur in different parts of the countries, possibly alongside each other, there is no option but to make ILR happen, and fast. Here are two components of it: the Himalayan and the Peninsular, with 14 and 16 links respectively. The idea is to build a dam on one river so that the water level rises at the head of the canal, allowing water to flow by gravity to the next river. India today has 5,100 large dams, which have walls at least 15 meters tall; ILR will require 3,000 more. The project will also involve building 15,000 km of new canals. If brought to fruition, ILR will bring 35 million hectares — over twice the size of Andhra Pradesh — of additional land into cultivation, and 34,000 MW more of hydroelectricity.
• The other adaptive measure is genetically modified crops. GM technology is a major component of ‘climate-smart agriculture’. We would need drought-resistant crops, and crops that produce more on the same patch of land so that climate-impairing ‘land use’ is minimized. India has been saying ‘no’ to GM technology. However, GM technology has been in use globally for over two decades and millions of people have been eating GM foods for years.