Sentence:  To put it bluntly, many of those who are <WSD>alertable</WSD> to the nonsensical environmental assumptions of economic theory are alerted by now, and major efforts to inform the remaining economists about the facts of life (Daily et al. 1991; daly and Cobb 1989; Ehrlich 1989; Ehrlich et al. 1992; Klaassen and Opschoo 1991; Perrings 1987; Victor 1991) seem unlikely to be very cost-effective. 
Meaning of the word marked with <WSD> tags:  Able to respond constructively to being alerted.