In her review, Susan Isaacs calls Diane Burko’s art an activist response to the call to arms to save the planet. “Diane Burko: Seeing Climate Change,” on view until Dec. 12, 2021, at the American University Museum at the Katzen Arts Center, is a wide-ranging overview of Burko’s beautiful abstract, photography- and map-linked paintings of eco-catastrophes today (melting glaciers, dying coral reefs).