🌡️ Climate Change & Indian Agriculture
Study greenhouse gases, global warming effects on crops and climate-smart agriculture for CUET. IPCC reports and adaptation strategies covered.
Climate Change and Agriculture
Climate change is one of the greatest challenges facing agriculture in the 21st century. Understanding its causes and impacts is critical for CUET.
Causes
- Greenhouse gases (GHGs): The main culprits are CO₂ (carbon dioxide), CH₄ (methane), N₂O (nitrous oxide), and CFCs (chlorofluorocarbons). Each of these gases traps heat in the atmosphere and contributes to global warming.
- Human activities driving climate change include deforestation (fewer trees to absorb CO₂), burning of fossil fuels (coal, oil, gas for energy), and industrial emissions.
- In the agricultural sector specifically, rice paddies (flooded conditions create anaerobic environments that produce methane) and livestock (cattle produce methane during digestion — a process called enteric fermentation) are major sources of methane.
Impact on Agriculture
Climate change affects agriculture in multiple, interconnected ways:
- Rising temperatures reduce crop yields, especially in wheat and rice, because high temperatures during grain filling lead to smaller, lighter grains.
- Increased frequency of droughts and floods — extreme weather events are becoming more common, devastating crops in affected regions.
- Shifting of crop seasons and growing periods — traditional sowing and harvesting dates may no longer be optimal.
- Increased pest and disease incidence — warmer winters allow pests to survive year-round, and new pests may migrate to previously unaffected areas.
- Sea level rise threatens coastal agriculture by causing saltwater intrusion into freshwater aquifers and farmland.
- Melting glaciers affect river water availability — initially causing floods, but in the long term reducing water supply for irrigation.
The Greenhouse Effect
The greenhouse effect is the natural process that keeps Earth warm enough to support life — but human activities have intensified it to dangerous levels.
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Climate Change and Agriculture
Climate change is one of the greatest challenges facing agriculture in the 21st century. Understanding its causes and impacts is critical for CUET.
Causes
- Greenhouse gases (GHGs): The main culprits are CO₂ (carbon dioxide), CH₄ (methane), N₂O (nitrous oxide), and CFCs (chlorofluorocarbons). Each of these gases traps heat in the atmosphere and contributes to global warming.
- Human activities driving climate change include deforestation (fewer trees to absorb CO₂), burning of fossil fuels (coal, oil, gas for energy), and industrial emissions.
- In the agricultural sector specifically, rice paddies (flooded conditions create anaerobic environments that produce methane) and livestock (cattle produce methane during digestion — a process called enteric fermentation) are major sources of methane.
Impact on Agriculture
Climate change affects agriculture in multiple, interconnected ways:
- Rising temperatures reduce crop yields, especially in wheat and rice, because high temperatures during grain filling lead to smaller, lighter grains.
- Increased frequency of droughts and floods — extreme weather events are becoming more common, devastating crops in affected regions.
- Shifting of crop seasons and growing periods — traditional sowing and harvesting dates may no longer be optimal.
- Increased pest and disease incidence — warmer winters allow pests to survive year-round, and new pests may migrate to previously unaffected areas.
- Sea level rise threatens coastal agriculture by causing saltwater intrusion into freshwater aquifers and farmland.
- Melting glaciers affect river water availability — initially causing floods, but in the long term reducing water supply for irrigation.
The Greenhouse Effect
The greenhouse effect is the natural process that keeps Earth warm enough to support life — but human activities have intensified it to dangerous levels.
- Short-wave solar radiation from the Sun enters the Earth's atmosphere and reaches the surface.
- The Earth's surface absorbs this energy and re-emits it as long-wave (infrared) radiation back toward space.
- Greenhouse gases trap this outgoing infrared radiation, preventing it from escaping into space and thereby warming the atmosphere.
- CO₂ concentration has risen from 280 ppm (pre-industrial era) to over 420 ppm (current) — a dramatic increase that is the primary driver of enhanced global warming.
WARNING
Agriculture contributes about 14% of India's total greenhouse gas emissions, mainly from CH₄ (rice paddies and livestock) and N₂O (from fertilizer use). This makes agriculture both a victim and a contributor to climate change.
Key Points to Remember
- Major GHGs: CO₂, CH₄, N₂O, CFCs
- Agriculture contributes ~14% of India's GHG emissions (mainly CH₄ from rice paddies & livestock)
- CO₂ has risen from 280 ppm (pre-industrial) to >420 ppm (current)
- Greenhouse effect mechanism: short-wave solar radiation in → long-wave infrared radiation trapped by GHGs
- Climate change impacts on crops: yield loss in wheat & rice, shifted seasons, more pests, coastal salinity intrusion
- Enteric fermentation in cattle = major agricultural source of CH₄
Summary Cheat Sheet
| Concept / Topic | Key Details / Explanation |
|---|---|
| Major Greenhouse Gases | CO₂ (carbon dioxide), CH₄ (methane), N₂O (nitrous oxide), CFCs (chlorofluorocarbons) |
| Human Activities Causing Climate Change | Deforestation, burning fossil fuels (coal, oil, gas), industrial emissions |
| Agricultural Sources of CH₄ | Rice paddies (anaerobic flooded conditions) and livestock (enteric fermentation in cattle) |
| Agriculture's Share of India's GHG Emissions | ~14% (mainly CH₄ and N₂O) |
| N₂O Source in Agriculture | Fertilizer use (nitrogen fertilizers release nitrous oxide) |
| Impact — Temperature on Crops | Rising temperatures reduce yields in wheat and rice (high temp during grain filling → smaller, lighter grains) |
| Impact — Extreme Weather | Increased frequency of droughts and floods devastating crops |
| Impact — Crop Seasons | Shifting of crop seasons and growing periods; traditional dates may no longer be optimal |
| Impact — Pests & Diseases | Warmer winters allow pests to survive year-round; new pests migrate to previously unaffected areas |
| Impact — Sea Level Rise | Saltwater intrusion into freshwater aquifers and coastal farmland |
| Impact — Glaciers | Melting glaciers → initial floods, long-term reduced irrigation water supply |
| Greenhouse Effect — Mechanism | 1. Short-wave solar radiation enters atmosphere. 2. Earth absorbs and re-emits as long-wave (infrared) radiation. 3. GHGs trap outgoing infrared radiation → warming. |
| CO₂ Concentration | Pre-industrial: 280 ppm. Current: >420 ppm. |
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