2) Energy auditor
Energy auditors are on the front lines in the war against inefficiency. They're responsible for evaluating the efficiency of heating and cooling systems as well as the insulation and weatherproofing of homes and businesses. They look for air leaks, missing or incomplete insulation, and make suggestions about the steps necessary to fix problems. Energy auditors often follow up by doing the actual weatherization work, fixing the problems they find in the audit. It's a life of crawling around basements, caulking gaps between windows and running full-home air-leak tests.