Project Slingshot launches Tube ads on pig CO2 slaughter

A new advertising campaign by animal welfare group Project Slingshot has launched across the London Underground, highlighting the use of carbon dioxide gas chambers in pig slaughter and backed by several high-profile celebrities.

The campaign features posters with messages from supporters including comedians Diane Morgan, Jen Brister and Shabaz Ali, television doctor Amir Khan, and athlete and TV personality Mathew Pritchard. Each ends with the phrase "I don't buy it," rejecting industry assertions that CO2 gassing constitutes humane slaughter. "I looked up humane in the dictionary and I have to say gassing didn't come up," Diane Morgan said.

Additional backers include comedian Simon Amstell, author Rutger Bregman, actor Sir Mark Rylance, Meat Free Monday founders Paul, Mary and Stella McCartney, and MP Neil Duncan-Jordan. "We've been told for decades that CO2 gas chambers are humane. The pigs screaming inside them tell a different story. I don't buy it. The public doesn't buy it. Westminster shouldn't either. Ban them," Duncan-Jordan said.

In England and Wales, about 90 percent of pigs are slaughtered using CO2 gas chambers. A 2025 report from a government advisory body found...