"Since 1993, sea levels have risen about 0.5cm (0.2 inches) per year, according to a 2011 Australian government report."

That's 14 cm of elevation on sea level alone.

Coastal erosion can be mitigated, but I don't think Tuvalu has the resources to build and deploy the required amount of breakwaters required to protect the island themselves. Climate change is something that has to be addressed at a global level.

edit: math correction