Having the first Leadership in Energy and Environmental Design certified building in Gwinnett County, The Environmental and Heritage Center plans to highlights its sustainable features with a Build It Green event. Build It Green will be from 10 a.m. to 4 p.m. Monday, Jan. 19, at the EHC. Program fees are $5 for ages 13 and older, $3 for ages 3 to 12 and free for children 2 and younger and EHC members. During the event, the EHC plans to explore STEM (science, technology, engineering and math) and feature its sloped vegetated roof, which is one of the largest in the country.