Development, environment and health: what else we should know

The Daily and Ehrlich article presents, as expected, a detailed account of the myriad interrelationships between development, global change (notably population growth and global warming), environment and disease. It is a first-class exposition of what we know, and it would be invidious to raise a critical eyebrow about it. In this comment, I take a look at what we do not know—what we know we do not know, what we ought to know, and what we do not know we do not know. Hence it is a piece that reflects speculation supreme, albeit informed (and hopefully inspired) speculation.