As climate change progresses, trees in cities struggle

SEATTLE (AP) — Cities across the world have promised to plant more carbon-absorbing trees to help fight climate change. Research has shown the shade of mature trees also helps reduce unhealthful “heat islands,” especially in poor neighborhoods. But life of a city tree is already challenging and those problems are being compounded by a warming planet. Increasingly, the challenge for city arborists is to keep old and new trees alive, and it’s incurring a bigger hit on municipal budgets.