In order to save people from trace amounts of natural, invisible, harmless atmospheric gas, should you put slippery substances on public roads?

BBC News - Police arrest 12 activists in climate change protest

In Leith, six climate change activists staged a protest at the offices of Forth Energy.

Lothian and Borders Police also said that protesters appeared to have spread an oil-like substance over roads on the outskirts of Edinburgh.
Police surround the headquarters of the Royal Bank of Scotland Officers have been policing the headquarters of the Royal Bank of Scotland

A spokeswoman said the oil, possibly diesel or vegetable oil, had been spilled onto the A720 at Bankhead and the westbound lane of the A8.

The roads have now been cleaned and traffic is moving as normal in the area.

Police described it as "an extremely reckless and dangerous act which could put many members of the public at risk".