Final answer:
The Shonkoff (2012) reference is not present in the provided citations, therefore a direct response about Shonkoff's suggestion cannot be given based on the available information.
Step-by-step explanation:
The request for information regarding what Shonkoff's (2012) suggestion entails cannot be directly answered as the provided references do not include a work by someone with the last name Shonkoff from the year 2012. Instead, the references list includes a variety of sources covering topics from education, health, economics, to environmental conservation.
However, given the broad span of topics, it is possible that Shonkoff's (2012) work might relate to human development and public policy, particularly in the context of early childhood education and intervention, as this is a common subject of interest for researchers with that surname in that time period.