Search “Data Science for Social Good” online you’ll find lots of information.
It doesn’t have to be a big issue, many of the questions you ask can be best answered by data.
What factors make some people live longer than others? Are the schools in one part of your neighborhood better than schools in another part? How would you measure that? Answering these questions involves collecting and manipulating data, from sports stats to record sales to census data. (Data Science learning module from Bootstrap)