A barefoot protest would be more convincing

Approval of new drilling in North Sea ‘would break Labour’s manifesto’

Protesters, who were dressed as firefighters in front of a banner reading ‘world on fire’, gathered in London.

 

Source

Could be wrong, but from what I see those people are wearing shoes mostly made from oil-derived products such as polyurethane, nylon and EVA.

A barefoot protest would be more convincing. Not much more convincing in summer though.