I don’t believe that was the same group, but I’m fairly certain that protest just involved leaving a note on the windshield and using a lentil to deflate the tires. Their notes did touch in the environmental impact of SUVs, but from what I recall the notes focused on the negative impacts that SUVs have in cities. Such as the skyrocketing number of pedestrian deaths we are seeing.
The price of building solar and wind is going down everyday. Natural gas will only continue to increase in price as more and more public pressure mounts towards ending our use of fossil fuels. Coal is already not economically viable without government subsidies. Betting on the cost of fossil fuels staying low is a losing strategy.