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Fair enough. Keep in mind that they are not protesting traffic congestion or pollution. They are trying to force the government to act on the issue of climate change, as they see it as the most important and serious challenge facing the planet.
A line they keep repeating is that they are sorry for the disruption, but it is minor compared to the disruption we all face if government doesn't act now.
Do you lay tacks for people commuting by bike. Means they'll take notice rather than just appreciating the empty roads.
(/facetious)
Blocking the busiest roads is visible and disruptive. Highlights how much more pleasant an area is without incessant traffic and pollution. Public transport is counter intuitive for me.