To respond to that fully would fall foul of the no politics rule on here.
Client Earth's tactics are far from 'passive' as they aggressively use the system against itself by holding them up to the light of their own declared standards,and they've had very good success in the past.
The fact that any behavioural scientist worth a light could go through the number of separate reasons why Extinction Rebellion in particular, and Greenpeace's methods are poor ways of changing behaviours, is actually quite revealing of the non-scientific basis of those groups.
A fair test of someone trying to change the world could be if they've managed to change their own house. Roger Hallam, the mouth behind ER and insulate Britain lives in a farmhouse that has been zero rated for insulation and energy efficiency (ie, it has no insulation), and has at least six raggedy diesels parked there at various times, none of which would pass the London LEZ standard.