Subject: Geography

Petroleum reserves are found in sedimentary basins, where organic matter is trapped under pressure. Offshore reserves account for ~30% of global crude oil production. Their distribution is linked to continental shelf geology, passive margins, and deep-water basins.

Geographical distribution

The Persian Gulf (Middle East)- result of the collision between the Arabian and Eurasian plates, which created perfect “anticline” traps for oil. Eg- Safaniya field (Saudi Arabia), largest offshore oil field in the world.

The Gulf of Mexico (North America)- It is characterized by salt domes that trap oil in the surrounding porous rock.

The North Sea (Europe)- Situated between the UK, Norway, and Denmark. This region is a rift basin, with deep depressions where organic matter could settle.

The South Atlantic Margins (Brazil & West Africa)- formed when South America and Africa drifted apart.

Southeast Asia & India- in the South China Sea and India’s Mumbai High and Krishna-Godavari (KG) Basin

Difference between off-shore and on-shore oil reserves

Implications of uneven distribution of mineral oils in the world

Energy security challenges – Oil-deficient countries face high import bills and current account deficits. Eg- India imports ~85% of its crude oil requirement.

Resource Curse in Oil-rich Nations (Paradox of Plenty) – Overdependence on oil leads to limited economic diversification. Eg- Venezuela’s economic crisis.

Energy trade is one of the key drivers of global geopolitics. Eg- US sanctions on Russian and Iran oil trade

Competition for oil resources leads to wars and regional instability. Eg- Gulf Wars, Saudi-Iran rivalry.

Oil-rich regions face oil spills, land degradation, and marine pollution. Eg- Niger Delta pollution.

Global Carbon Emissions – oil and gas industry is responsible for over 5 billion tonnes of CO2 equivalent in direct emissions annually (15% of total energy-related emissions)

In the long run, reducing oil dependence through clean energy, strategic reserves, and diversified supply chains is essential for ensuring equitable and sustainable global development.

The Ganga River Basin houses around 43% of India’s population (600 million) in about 26% of its geographical area. The average population density exceeds 520 persons/km².

Distribution and Density of Population

Upper Ganga Basin

Characterized by low density (approx. 150-300 persons/km²).

Rugged terrain and steep slopes restrict large-scale habitation to river valleys like Dehradun and Haridwar.

Middle Ganga Plain – “demographic heartland” with very high density (800-1,100+ persons/km²).

Lower Ganga Plain – extremely high density (exceeding 1,000-1,300 persons/km²), particularly in the deltaic regions and the Kolkata Metropolitan Area.

Impact of Land on Distribution and Density of Population

Extensive level plains support agriculture, transport, and urban expansion. Eg- eastern Uttar Pradesh and north Bihar.

A high proportion of cultivable land supports intensive agricultural activity. Eg- Rice-wheat belt of the middle Ganga plain.

Deltaic plains – Urban and industrial concentration. Eg- Kolkata-Howrah region in the lower Ganga plain.

Piedmont and Tarai zone – Forests converted into agricultural land increased settlement. Eg- Tarai region of Uttarakhand and Uttar Pradesh.

Himalayan Foothills-In the Upper Basin (Uttarakhand), rugged terrain restricts population to valley floors. Eg- Dehradun and Haridwar

Ease of Habitation-The vast, flat alluvial plains allow for the construction of dense transport networks. Eg- National Highway 19 corridor connects mega-cities like Delhi, Kanpur, and Kolkata.

Gentle Slope-A gradient of barely 20cm/km facilitates large-scale urban sprawl. Eg- The rapid expansion of cities like Noida and Ghaziabad

Doab Regions-The fertile land between two rivers (Doabs) shows the highest density. Eg- The Ganga-Yamuna Doab

Impact of soil on distribution and density of population

Alluvial Dominance-Over 70% of the basin is covered by nutrient-rich alluvium, supporting 80% of its population.

Soil suitable for diverse crops – Rice, wheat, sugarcane, pulses and jute support a dense population. Eg- Jute cultivation in West Bengal delta.

Khadar (New Alluvium)-Annually replenished by floods, these soils support intensive agriculture. Eg- North Bihar plains sustain a density of over 1,100 persons/km² due to its high productivity.

Bhangar (Old Alluvium)-Stable, older soils support the wheat-sugar cane belt and high rural density of Western Uttar Pradesh.

Multi-cropping Potential-Eg- Farmers in the Lower Ganga Basin (West Bengal) grow three rice crops (Aman, Aus, Boro), sustaining very high rural populations.

Deltaic Silt-The nutrient-dense silt in the Sunderbans and Bengal delta supports high-intensity fishing and farming. Eg- High densities in districts like South 24 Parganas despite the risk of cyclones.

Impact of water on distribution and density of population

Perennial river system – Reliable water for domestic and agricultural use supports dense settlements. Eg- Kanpur on Ganga bank.

Extensive canal irrigation supports agricultural intensification and increases rural density. Eg- Upper Ganga Canal in western Uttar Pradesh.

Groundwater Availability-Eg- The widespread use of tubewells in the Bihar plains allows for dense human clusters away from the main river.

Inland water transport supports urban growth. Eg- Eg- National Waterway-1 along the Ganga.

Major Challenges

Very high population pressure on land – Average landholding size in Bihar and eastern UP is less than 1 hectare.

Frequent floods – Displacement and loss of livelihood. Eg- Annual floods in north Bihar.

Groundwater depletion – Over-extraction for irrigation in western and central UP.

Water pollution – Eg- Industrial and domestic waste in Kanpur-Varanasi stretch.

Declining soil fertility due to overuse of fertilisers. Eg- Green Revolution areas of western UP.

Unplanned urbanisation – Pressure on land and water resources

Climate variability – Irregular monsoon and heat stress impact agriculture productivity and public health.

Efficient land use planning, flood management, groundwater regulation, and soil conservation are essential for maintaining the region’s demographic and ecological balance.

Society

Salient Features

India has emerged as a global leader in solar energy with over 140 GW of installed solar capacity (Nov 2025) and ranks 3rd in the world in solar capacity and generation.

Ecological Benefits

Carbon Sequestration

By replacing coal-fired thermal power, which is the primary source of CO-2 emissions. Every 1 GW of solar power reduces CO2 emissions by approximately 1.5 million tonnes annually.

Supports India’s NDC targets – 500 GW non-fossil capacity by 2030 and net-zero by 2070.

Water Conservation – Use 95% less water than thermal power plants. Shifting to solar saves roughly 2.5 liters of water per kWh generated.

Preservation of Fragile Ecosystems – Installing panels on reservoirs reduces water evaporation and algae growth. Eg- Omkareshwar Floating Solar Park (Madhya Pradesh).

Agrivoltaic Biodiversity – “Solar farming” allows crops to grow beneath panels, creating a micro-climate that reduces soil moisture loss.

Reduction Air Pollution – Unlike fossil fuels, solar generation releases zero SOx, NOx, or particulate matter (PM 2.5).

Soil Reclamation – Solar parks built on saline or degraded “wastelands,” prevent further soil erosion. Eg- Khavda Hybrid Park in the Rann of Kutch

Transition to Circular Economy – Eg- Draft Solar Waste Management Rules mandate recycling of end-of-life panels.

Protection of Glacial Regions – Eg- Solar projects in Ladakh (13 GW planned) can reduce black carbon deposits on glaciers, which otherwise accelerate melting.

Economic Benefits

Cost Savings for Households – Solar tariffs are lower compared to coal based power.

Reduction in Energy Import Bill – Solar energy helped India save roughly $4.2 billion in fuel costs in 2024-25, strengthening the Current Account Balance.

Boost to Domestic Manufacturing (PLI Scheme) – Solar manufacturing capacity jumped from 38 GW to 74 GW in 2025, attracting ₹52,900 crore in fresh private investment.

Agricultural Income Diversification- Under PM-KUSUM Component A, farmers can earn income by installing solar plants on unproductive land.

Attraction of Global FDI – 100% FDI under the automatic route has made India a top destination for ESG-focused global funds.

Rural Electrification – Solar micro-grids provide 24/7 power to remote villages where grid extension is expensive.

Infrastructure Development – Mega solar parks bring roads, water, and connectivity to previously isolated regions.

Export Potential– India exported $1.5 billion worth of solar equipment in 2025.

Challenges in Solar Energy Generation

Intermittency and Storage Gap- shortage of Battery Energy Storage Systems (BESS)

Land Acquisition Hurdles for Mega-parks

Lack of grid connectivity

Import dependency- India still imports over 90% of its wafers and ingots from China.

Limited recycling infrastructure creates a toxic waste risk (lead and cadmium).

Poor Financial Health of DISCOMs- delayed payments to solar developers and deterring investment.

Steps Taken by Governments

PM-Surya Ghar- Muft Bijli Yojana to solarize 1 crore households by 2027

Solar Park Scheme- A target of 40 GW across 50+ parks by March 2026.

PM-KUSUM- Solarizing over 30 million irrigation pumps.

PLI Scheme- to boost domestic manufacturing of high-efficiency solar modules

A balanced strategy focusing on decentralised solar, grid expansion, storage systems, and region-specific planning is essential to achieve Panchamrit Targets.