This took place in central London three years ago as part of an Extinction Rebellion event and it is another indication of the religious overtones of environmentalists.
During the Middle Ages, people would self-flagellate while wearing itchy sackcloth in an effort to purge their bodies of sin. In this case, it is a public self humiliation ritual for participants to atone for their sins because they contributed to climate change.
Meanwhile, the clothes they wear are petroleum-based. Utter madness!