NREL engineers and technicians install the SUMR rotor onto the Cart 2 research turbine at NREL's National Wind Technology… https://www.rawpixel.com/image/3325568/free-photo-image-machine-blue-sky-cc0Free Image from public domain licenseGrass covered in frost textured background https://www.rawpixel.com/image/2255391/premium-photo-image-autumn-frost-background-photosView licenseGrass covered in frost textured background https://www.rawpixel.com/image/2255389/premium-photo-image-autumn-frost-background-photosView licenseGrass covered in frost textured background https://www.rawpixel.com/image/2255395/premium-photo-image-cool-weather-ground-autumnView licenseFog obscures the mountains outside Steamboat Springs, Colorado. Original image from Carol M. Highsmith’s America… https://www.rawpixel.com/image/582463/carol-highsmiths-colorado-photographFree Image from public domain licenseJapanese Camellia in the garden https://www.rawpixel.com/image/937580/red-japanese-camellia-bushView licenseGreat horned owl along lower Columbia RiverA great horned owl, with its beautifully colored yellow and black eyes, perches… https://www.rawpixel.com/image/9653206/photo-image-plant-tree-eyesFree Image from public domain licenseThe Canadian Coast Guard Ship in the Arctic Ocean. Original public domain image from Flickr https://www.rawpixel.com/image/4042541/photo-image-ocean-red-seaFree Image from public domain licenseView of the mountain from Lake Twenty-Two Trailhead. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3285519/free-photo-image-cc0-conifer-creative-commonsFree Image from public domain licenseWinding road in the winter with snow and green pine trees and a cabin with snow on the roof. Original public domain image… https://www.rawpixel.com/image/3282992/free-photo-image-avalanche-cc0-coniferFree Image from public domain licenseA pair of Sandhill cranes search for food on the grounds. Original from NASA. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/440890/free-photo-image-sandhill-cranes-florida-birds-spaceFree Image from public domain licenseAlpine landscape with rugged snowy peaks towering over evergreen woods. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3299932/free-photo-image-abies-alp-alpineFree Image from public domain licenseShrubs and evergreen trees under a thick snow blanket in Kalavryta. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3291279/free-photo-image-abies-alps-animalFree Image from public domain licenseSnow covered evergreen forest on a foggy day. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3295186/free-photo-image-snow-storm-abies-cc0Free Image from public domain licenseAutumn desktop wallpaper background, oak leaves, warm tone https://www.rawpixel.com/image/3920912/photo-image-background-texture-treeView licenseJapanese Camellia in the garden https://www.rawpixel.com/image/937565/red-japanese-camelliaView licenseHunting fox near Hayden Valley. Original public domain image from Flickr https://www.rawpixel.com/image/4039412/photo-image-background-nature-naturalFree Image from public domain licenseThe Canadian Coast Guard Ship in the Arctic Ocean. Original public domain image from Flickr https://www.rawpixel.com/image/4042408/photo-image-ocean-sky-redFree Image from public domain licenseGallatin Mountains as seen from Blacktail Deer Plateau. Original public domain image from Flickr https://www.rawpixel.com/image/4039406/photo-image-tree-forest-natureFree Image from public domain licenseFemale elk in snow, Mammoth Hot Springs. Original public domain image from Flickr https://www.rawpixel.com/image/4039510/photo-image-background-woods-forestFree Image from public domain licenseBull elk, Blacktail Deer Plateau. Original public domain image from Flickr https://www.rawpixel.com/image/4039451/photo-image-background-woods-forestFree Image from public domain licenseCow elk in snow, Mammoth Hot Springs. Original public domain image from Flickr https://www.rawpixel.com/image/4039513/photo-image-woods-forest-natureFree Image from public domain licenseFrozen field in wintertime https://www.rawpixel.com/image/2255409/premium-photo-image-autumn-frost-backgroundView licenseNature desktop wallpaper background, ice covering the sea in Greenland https://www.rawpixel.com/image/3906092/photo-image-background-wallpaper-aestheticView licensePine tree made from plastic pine christmas festival. https://www.rawpixel.com/image/14702473/pine-tree-made-from-plastic-pine-christmas-festivalView licenseWaterval bij Loenen in de sneeuw (1900 - 1930) by Richard Tepe https://www.rawpixel.com/image/13751383/waterval-bij-loenen-sneeuw-1900-1930-richard-tepeFree Image from public domain licenseBegraafplaats in Leeuwarden (1849) by Isaac Reijnders Sz, P Blommers Steendrukkerij van and W Eekhoff https://www.rawpixel.com/image/13763783/image-paper-plant-personFree Image from public domain licenseCold sea in Riga, Latvia. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3283443/free-photo-image-rain-water-nature-ocean-viewFree Image from public domain licenseAntarctica. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3284068/free-photo-image-antarctica-iceberg-glacier-wallpaperFree Image from public domain licenseAn empty leaf-covered road winding through an autumn forest in Blowing Rock. Original public domain image from Wikimedia… https://www.rawpixel.com/image/3282688/free-photo-image-tree-forest-countrysideFree Image from public domain licenseJapanese Camellia in the garden https://www.rawpixel.com/image/937675/red-japanese-camellia-bushView licenseImage showing the west coast of Greenland, one of Earth's premiere incubators for icebergs. Original from NASA. Digitally… https://www.rawpixel.com/image/441795/free-photo-image-aerial-view-mapsFree Image from public domain licenseA watchtower on the edge of a wooded forest treeline in the winter. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3303976/free-photo-image-abies-cc0-coldFree Image from public domain licenseA view of a snow covered bridge on a road in the middle of the forest. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3300145/free-photo-image-forest-snow-abies-bridgeFree Image from public domain licenseJapanese Camellia in the garden https://www.rawpixel.com/image/937613/red-japanese-camelliaView licenseStill image from Acres debut album Lonely World. Check them out at acresofficial.com https://www.rawpixel.com/image/598308/winter-rural-band-shootView licenseWind Turbines in rural Missouri. Original image from Carol M. 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