Climate Change and the Future of Assam Tea

Why in the News?

1. Rising temperatures, delayed rainfall, and erratic monsoons are severely affecting Assam’s tea-growing regions.
2. A new study (Tea Research Association + Ethical Tea Partnership) using Intergovernmental Panel on Climate Change (IPCC) climate models warns that major tea zones may lose suitability by 2050.
3. Tea yields, quality, prices, and livelihoods of over 12 lakh workers are increasingly under threat.

Key Highlights

1. Assam’s Changing Climate
   1. Seasonal patterns (cool winters, clear post-monsoon months) are disappearing.
   2. Persistent heat, muggy weather, and delayed monsoons now extend into November.
   3. Tea growers report wilting bushes, blackened leaves, and unpredictable flush cycles.
2. Narrow Climatic Requirements of Tea
   1. Ideal temperature: 13–28°C, optimum: 23–25°C.
   2. Required rainfall: 1,500–2,500 mm annually, evenly distributed.
   3. Prefers slightly acidic, organic-rich soils — once abundant across the Brahmaputra Valley.
   4. Climate change is shifting all these thresholds, stressing tea plants.
3. Scientific Evidence from Climate Models
   2. The study used 50 years of data, IPCC’s RCP 2.6 and 4.5, and MaxEnt models.
   3. Findings:
      1. Minimum temperature has risen 1°C in 90 years.
      2. Annual rainfall reduced by 200 mm.

• Future: cold-season rainfall decreases; monsoon rains become erratic.

2050. Currently “very suitable” tea regions (Upper Assam, South Bank, Cachar) will lose suitability by 2050.
2051. Tea cultivation may shift to higher altitudes (Karbi Anglong, Dima Hasao).

4. Economic Stress for Growers
   1. Climate impacts worsen, but tea prices remain stagnant.
   2. Auction prices increased only 4.8% annually, compared to 10% for staples like wheat and rice.
   3. Rising costs: labour, chemicals, energy, irrigation.
   4. Many estates cannot afford replantation or climate-resilient technology.
5. New Pest and Disease Patterns
   1. Extreme heat (>35°C) reduces nutrient absorption.
   2. Stressed plants become more pest-prone.
   3. Unlike crop farmers elsewhere, tea growers receive very limited government support during heat or drought.

Implications

1. Declining Tea Yield and Quality: Assam’s global brand value (flavour, aroma) depends on climate rhythms; disruptions threaten competitiveness.
2. Economic Vulnerability: Stagnant prices + rising input costs push plantations towards financial stress.
3. Risk to Livelihoods: Over 12 lakh workers, many from tea tribes, face job insecurity, lower wages, and worsening working conditions.
4. Shift in Tea Geography: Lower and mid-altitude regions may become unsuitable; production may move to hills.
5. Political Significance: With elections in 2026, the distress of tea tribes may become a major political issue.

Challenges and Way Forward

Conclusion

Assam’s tea industry must rapidly adopt climate-resilient varieties, better water and soil practices, diversified livelihoods, and stronger policy support to withstand warming trends and secure sustainable growth for farmers and workers.