The Big Picture: The federal government's Career Voyages site offers the most comprehensive statistics about "in-demand" occupations, employment resources, and info about training programs (careervoyages.gov). Also check out the Green Careers Center for job boards and conferences (environmentalcareer.com).
Energy Efficiency: Weatherization is the fastest-growing field among enviro jobs. Certification from the Building Performance Institute (bpi.org) or LEED (Leadership in Energy and Environmental Design; ) will set you apart.
Solar and Wind: The Department of Energy's Energy Efficiency and Renewable Energy career page can link you to career opportunities, job boards, and federal and state programs (eere.energy.gov/education
/careers.html). Also check out trade associations like the American Solar Energy Society (ases.org) and the American Wind Energy Association (awea.org).
Training Programs: Keep track of what's offered through the Interstate Renewable Energy Council (irecusa.org) and the DOE's adult-education Web site (eere.energy.gov/education/
adult_education.html).