China spent $13.8B restoring coastal wetlands from 2000-2020; scientists say benefits could be worth $434 billion

A new analysis of 237 coastal wetland restoration projects in China shows that between 2000 and 2020, the country spent up to $13.8 billion on restoring salt marshes, mangroves, and seagrass beds. Researchers now estimate the resulting ecosystem benefits, including carbon storage, storm protection, and water filtration, could be worth as much as $434 billion. That is a return of roughly 31 times the investment. The study, published in Global Change Biology, is one of the largest cost-benefit analyses of coastal restoration ever done. It suggests that nature-based solutions can deliver outsized economic and climate returns when done at scale. For anyone tracking carbon markets or climate finance, this is a concrete example of how restoration spending can be justified on economic grounds alone. The key question is whether similar returns are possible in other regions with different baseline conditions and project costs.