. >> eva welch you have looks at this, do you think it works. >> unfortunately, not. let me first say, that i have much admire the motives of the people that are trying to do this, pollution is one of the big issues that we face today. but unfortunately, there's no evidence that divesting from companies has ever looked. which were far more coordinated and far easier to enforce, and unfortunately, none of them really made a difference, so i would argue that in the end, overturned apartheid, was that there was a better alternative, that the voters could vote for, which was nelson mandela. i think if you really want to change policy, what you need to do is put pressure on the politicians to change our policies. i covered the divestment movement in the 1980's, and the companies themselves howled and the government tried to exert pressure in the united states. if it wasn't doing anything, why did they bother. >> they -- the it's hard to say. it is hard to judge the motives. we know there were many other escape values so the boycott was never perfect. there were always othe