The risks and impacts of a 1- or 2-m sea level rise differ substantially for coastal cities and island nations. But perhaps even more important for planning is whether that flooding occurs in 2050 or 2150. This question can only be addressed by constraining the rates of ice loss, which must be a top research priority. Determining ice loss rates requires continued development of monitoring capacity, a sustained focus on process studies, and further integration of observations and modeling efforts.”

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