A 'concrete' solution to climate change; Depths of Wikipedia

A new direct-air-capture plant in Tracy, California, will pull up to 1,000 tons of carbon dioxide directly out of the air each year. The company that built it says the removed carbon will be permanently sequestered inside concrete. As part of our Reverse Course series, Peter O'Dowd went to a concrete plant in San Jose to understand how it works. And, Grist's Jake Bittle talks about the Marshall Islands' plan to adapt to the effects of climate change. Then, writer Annie Rauwerda makes a habit of getting lost among the seemingly endless digital archives of Wikipedia. She created an Instagram account to document some of the best facts she's found. Rauwerda tells us about the weird and wonderful world of Wikipedia.