The field of public health deals with maintaining and monitoring the health of communities, and with the detection, cure, and prevention of health risks and diseases. Although public health is generally seen as a community-oriented service, it actually starts with the individual. From a single individual to the family unit to the smallest isolated rural town to the worldwide global community, one person can influence the health of many.

Compile a workbook, physical or digital, to document your mastery of the requirements of the badge as it is covered in the class to show your Scoutmaster proof of what you learned. 
http://usscouts.org/mb/worksheets/Public-Health.pdf