The major threats posed by climate change to India's coastal regions are sea-level rise, storm surges, coastal erosion, and ocean acidification. These threats affect India's coastal states by damaging infrastructure, causing loss of life and property damage, and reducing the productivity of fisheries.

• Sea-level rise: This threatens to submerge low-lying areas, increase salinity intrusion, and increase the risk of flooding in coastal areas.
• Storm surges: This poses the risk of damage to coastal infrastructure, including ports, harbors, and fishing boats.
• Coastal erosion: This results in the loss of land and the destruction of coastal ecosystems and habitats.
• Ocean acidification: This affects fish and other marine life, affecting the livelihoods of fishermen and impacting the tourism industry.

To build resilience, India's coastal states need to take steps such as investing in disaster risk reduction infrastructure, implementing coastal zone management plans, restoring degraded coastal ecosystems, and enhancing awareness and education among the communities.