From the Salon interview with McKibben:
Salon: Do you see that as something that’s more symbolic, or do you think it could have a real economic impact?
McKibben: I think it’ll have its real economic impact, oddly, through symbolic action. We can’t bankrupt Exxon. But we can politically and morally bankrupt them. We can’t bankrupt them financially in the short run – they have lots of money. But we can reduce their political power dramatically. When the United Church of Christ, the oldest Protestant denomination in the country – it traces its roots back to the pilgrims – when they say, we don’t want to be invested in these guys, involved with these guys, that counts.