Here is a depressing fact: over the coming decades, sea-level rise will continue to threaten ecosystems, communities and cities. No matter how quickly we reduce our carbon emissions, our past emissions commit us to ongoing sea-level rise, given the long-drawn-out impact of climate warming on the oceans and ice sheets. Just how bad it gets, however, will depend on our current and future emissions.
Even as we strive for net-zero emissions, we must prepare for devastating possibilities. But decision-makers face a major obstacle: the specific rate and magnitude of future sea-level rise is deeply uncertain. Different methods produce different projections of long-term sea-level rise. The problem of reconciling these different methods and projections has undermined planning to protect people from future sea-level rise.
In a recent paper published in Earth’s Future, we and our colleagues tackle this problem. We propose a new method that combines the complementary strengths of different sea-level projections. We use our method to quantify the uncertainty of future sea-level rise. It allows us to estimate a “very likely” range. “Very likely” means that there is a 9-in-10 chance (90% probability) that future sea-level rise will lie within this range, if our future emissions follow an assumed emissions scenario.
