Search method needed

[Sally Metcalf]

For our rookie recruiters looking to narrow down desk specialties, I have two questions I'd like to KNOW HOW TO ANSWER.
1. In the field of medical devices (or sustainability/environment), where is there growth and hiring?
2. In those areas of growth and hiring in each of the above two specialties, which are NOT well-covered already by recruiters?

How would I search the web to answer these two questions effectively?
Thank you very much.
Sally