![](http://www.alamy.com/thumbs/6/51BDBCAC-3039-4576-AC56-749371521B34/HA7JG4.jpg)
usdagov 5707362958 20110505-RD-LSC-0750
Size: 1959px × 1276px
Photo credit: © Nature and Science / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: -op, 000, 1, agriculture, america, boilers, brookview, btu, cement, climate, computer, controlled, cooperative, curtain, department, development, efficient, embedded, energy, fall, farm, farms, filled, fin-tube, food, foundation, fueled, glass, good, harvest, heat, line, local, lulus, microclimate, mounted, national, nature, nps, online, park, politics, program, propane, radiant, reap, renewable, richmond, roof, rural, savings, science, station, tubing, usa, usda, vents, virginia, water, weather, zone