Five pipelines in USA were temporarily shut down by American protesters. The pipelines chosen where delivering tar sands bitumen from Alberta. The protesters claimed they had no options because Canadian and USA governments were not responding to calls for tar sands shut down.
The protesters did no harm. At a set time, five different subgroups cut the chains on the valves and proceeded to simultaneously shut off the flow of tar sands bitumen on the five pipelines by turning the valves to the off position. These valves are located in remote areas. Oil companies where quick to restore the flow.
Global warming is accelerating primarily because of fossil fuels. Tar sands are one of the top emitters of CO2 per usable unit of energy.
These middle aged protesters know they face the possibility of criminal charges.