Evaluate the potential of natural geotextiles such as coir in sustainable infrastructure development in India.

Geotextiles are permeable fabrics laid in soil to reinforce it, filter and drain water, and control erosion. India produces about two-thirds of the world's coir [4], so coir geotextiles offer a home-grown, biodegradable substitute for petroleum-based synthetics. Their potential is substantial but still largely untapped.

Potential: why coir suits sustainable infrastructure

• Engineering fit: coir is renewable, strong for a natural fibre and slow to decompose. It holds slopes until vegetation takes root, which makes it well suited to erosion control [2].
• Institutional acceptance: the Indian Roads Congress accredited coir geotextiles for road construction in 2011, and RDSO has issued guidelines for using them in railway embankments [1].
• Circular economy: coconut-husk waste becomes an infrastructure input, a waste-to-wealth model [4].
• Inclusive growth: the sector employs 7 lakh+ workers, about 80% of them rural women [4]. Demand from public works can create rural livelihoods (SDG 5, 8).
• Policy push: GST on coir geotextiles was cut from 12% to 5%, making them about 6–7% cheaper against synthetics [5]. More than 150 machines and technologies have been developed since 2014-15 [4].

Limitations

• Weak high-value uptake: geotextile exports declined in FY 2021-22 even as overall coir exports grew [6].
• Raw-material gap: only about 30% of coconut husk is effectively used [7]. Processing is concentrated in Kerala, so husk from other coconut-growing regions often goes unused.
• A polluting first step: traditional retting is "highly polluting of surface waters". CCRI's microbial-enzyme method cuts retting to 3–5 days without losing fibre quality [3], but its adoption is not tracked.
• Functional limits: because it is biodegradable, coir suits temporary functions such as slope stabilisation until vegetation establishes. It is not suited to permanent load-bearing reinforcement.
• Standards deficit: the lack of internationally accepted standards hampers coir trade [8].

Coir geotextiles combine engineering use, green credentials and women's livelihoods, which makes their potential high but under-realised. To realise it, India should mandate coir in rural roads and rail embankments and build processing clusters in coconut belts outside Kerala. It should also tie Coir Vikas Yojana machine subsidies to enzyme retting and push for BIS and international standards. Done this way, coir can bring "waste-to-wealth" into India's infrastructure push and advance SDGs 9 and 12.