After studying more than 1,500 coastal ecosystems, researchers say they will drown if we let the world warm above 2C

Much of the world's natural coastline is protected by living habitats, most notably mangroves in warmer waters and tidal marshes closer to the poles. These ecosystems support fisheries and wildlife, absorb the impact of crashing waves and clean up pollutants. But these vital services are threatened by global warming and rising sea levels.