New Orleans may have crossed a climate tipping point. Almost 75% of the region will be underwater by 2070 because of rising sea levels, and will need large-scale depopulation. Without rapid mitigation and adaptation, other low-lying regions may face similar risks.

New Orleans may have crossed a climate tipping point. Almost 75% of the region will be underwater by 2070 because of rising sea levels, and will need large-scale depopulation. Without rapid mitigation and adaptation, other low-lying regions may face similar risks.