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India: Bangalore-based climate tech start-up CarbonStrong has raised US$1.3m in a seed round. The start-up turns industrial waste into a supplementary cementitious material (SCM) that can replace up to 50% of the cement used in concrete. It says that its product is 30% cheaper than cement, improves durability and works within existing plants without new equipment. The seed round will fund CarbonStrong’s first production facility, team expansion and further product testing as it moves from trials to commercial-scale output. The company aims to produce 100,000t/yr of the material by 2028. It has run pilots and demonstration projects across Banglaore, Hyderabad and Chennai, and now targets long-term supply deals with producers, builders and contractors.