Climate summit achieved new unity. Now there are pledges to fulfill.

The COP27 story is a familiar one: Summit on climate change achieves far less than hoped for. Yet a breakthrough between rich and poor nations this year shows how cooperation and diplomacy can bear fruit.

For Salote Nasalo, from the island nation of Fiji, newly promised climate aid for developing nations can’t come quickly enough.

As a specialist on so-called loss and damage from climate change, she came here to this year’s United Nations climate summit in Sharm el-Sheikh, Egypt, and was among those who tirelessly pushed for the cause...