Preaching and teaching in a warming world

Dams generate hydropower , the world's largest share of clean energy . But for many freshwater fish, they're a barrier and a major reason their populations are struggling.

This Seattle company is helping fish to migrate around these obstacles, shooting them through a tube on a cushion of water, with no extra stress, injury or lower survival rates.

Global warming trends mean more frequent, intense heat waves . That's bad news for cities, where extreme heat strains crucial infrastructure and risks public health.

But cities around the world are finding solutions for warming cities: planting trees, redesigning buildings and supporting vulnerable communities with solar-powered cooling systems and vital resources.

In the United States, where environmentalism is a heavily politicized issue , almost 90% of faith leaders across all major Christian denominations believe in at least some degree of human-caused climate change . But only about half have ever discussed it with their congregations.

That hasn't stopped Reverend Bradley Mattson and Brother Ken Taylor . They've used their sermons and small acts of environmental stewardship to encourage climate action, and have met with a varied response.

Singer‑songwriter Vicent Kikabi, known as Green Daddy, is using music and grassroots education to spark sustainable change in Uganda .

With hard-to-miss neon-green hair and an urgent message, he is creating an "environmental army" of young learners who carry his message beyond the classroom.

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