An experiment with roots at M.I.T. used A.I. and satellite images to grow a coastline in the Maldives. More projects are planned for Boston and Miami.

The state is a major importer of fracking wastewater, which gets pumped underground but doesn’t always stay there. The city of Marietta is fighting back.

The database of federal global warming research recreates a website that was closed amid the administration’s broad retreat from climate science.

A pilot program is building solar panels over irrigation canals to generate electricity. As a bonus, the shade prevents water from evaporating.