I wrote earlier about the US Green Building Council’s LEED AP (Leadership in Energy and Environmental Design Accredited Professional) certification program. LEED is a 4-tier rating system for high-performing buildings that encourages a systemic approach to sustainable design. Historically, most LEED APs were architects, mechanical engineers, and other niche green building professionals. With the demand for green buildings and sustainable design booming, an increasing number of professionals are becoming LEED AP certified (more than 75K and climbing rapidly). For about $650 and a lot of focused studying and serious dedication, you too can become a LEED AP.