"Second, because the way to encourage people to fund projects is to show evidence that they work , not that they are futile and ineffective. One might almost suspect that these groups would prefer maternal mortality to remain high.

Or, as a prominent climate scientist said in another context,

"If we want a good environmental policy in the future we’ll have to have a disaster."" http://www.rationaloptimist.com/blog/hold-good-news
(Nicely bird-dogged from www.cafehayek.com)

One of the ten rules of economics - incentives matter. If we can't take into account these 'interest group' incentives to keep the news bad, we'll never be able to sort out the facts. This is why we should never assume that because 'a majority of scientists thing human actions are causing climate change' that we're getting some beam of truth from a scientifically sterile laboratory. They have incentives to tell us things they want us to hear, regardless of the truth of the matter.