Now, I'd be happy to support your gluing yourself to footpaths and freeways, as long as I have the right to remove you for obstructing my way. The problem is my options are fairly limited if I'm stuck in traffic for three hours because you're "demonstrating".
A common argument in favour of these disruptive tactics is "yeah but the planet is DYING, this is an EMERGENCY!" OK, go do something about it - other than gluing yourself to the road. Go study science and engineering. Please. Because the more people working on the problem, the quicker we'll get solutions. Don't you CARE?