Tech companies want to capture carbon at paper mills and sewage plants

Google, Salesforce, H&M and other brands have turned to unlikely allies to help them clean up their carbon pollution: sewage treatment plants and paper mills. The companies joined an $80 million plan to take CO2 out of the atmosphere, though the strategies they’re using have yet to show whether they can have a meaningful impact on climate change.

They’re paying $32.1 million to a startup called CREW that aims to trap carbon dioxide emissions...