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Climate change is fueling the frequency and severity of wildfires, but a little-known Clean Air Act rule lets environmental agencies downplay the impacts of wildfire smoke. A collaborative investigation into this loophole connected dots that even the experts didn’t know about. Journalists Dillon Bergin and Molly Peterson explain their reporting process and offer advice for following your own local leads.

Toilet-to-tap water jokes aside, the technology and economics of turning sewage into potable drinking water is increasingly seen as a remedy for water-stressed communities. The new BookShelf review of “Purified: How Recycled Sewage is Transforming Our Water,” explains how water shortages, climate change, unsustainable growth and other factors have led some communities, most recently Los Angeles, to consider going “all in” on purified wastewater.

The global warming gas methane was much in the news at the start of the just-ended COP28 climate meeting, with a final Biden administration rule to trim releases by the fossil fuel industry. But when it comes to good journalism on the problem, the latest Reporter’s Toolbox spotlights the work of a team of journalism students who used sophisticated satellite data to tell the story of underreported methane flaring at drilling sites.

If extreme heat seems an unusual subject for December, the new EJ InSight column reminds us that among the natural disasters sweeping 2023 were waves of devastating global highs. Yet telling that story visually is an enormous challenge, acknowledges former LA Times photo editor Silvia Rázgová, who shares insights into how to portray the seriousness of extreme heat, getting beyond the cliches and connecting (safely) with its dangerous reality.