—— Green may be the most common color found in nature—it's everywhere from leaves, grass, and moss （苔藓）to snakes, butterflies, and even the northern lights（北极光）. Green represents life, vitality（活力）, nature, and, of course, environmentalism（环保）.
In a nocturnal(夜间的） rendezvous（幽会）, two green tree frog meet face-to-face atop(在...顶上） a leaf in Louisiana's Atchafalaya River Delta （路易斯安那州阿查法拉亚湾河口）
The northern lights, or aurora borealis （北极光）, produce a brilliant(光辉的） display in the skies near yellowknife, Northwest Territories, Canada（加拿大北部的耶落耐夫镇）. The phenomenon （现象）is produced by the action of solar wind （太阳风）on the atmosphere at Earth's Poles（地极）.
A pool of water at the mouth of Rio Frio Cave（里欧弗里欧洞口） reflects（反射） the greenery （草木）of Belize’s Chiquibul Forest（伯利兹城齐可布尔森林） and frames （勾勒出） a visitor in silhouette （轮廓）. The easily accessible （可到达的） river cave is a popular attraction.
A bird's-eye view （鸟瞰） captures （捕获） the serpentine （蛇般蜿蜒的） course of a river in Peru’s mountainous Chachapoya region（秘鲁查查波亚山区）. Herds of grazing cattle （一群群在吃草的牛）can be seen as tiny specks （小斑点） on the vast, green landscape （风景）.
A green tree snake peers （凝视）from its leafy perch in Costa Rica’s Caribbean lowland （哥斯达黎加的加勒比海低地. These tropical rain forests（热带雨林） surround the famed La Selva Biological Station（拉塞尔瓦生物研究站）, a center for ecological（生态） research.
A rare white alligator （白短吻鳄） swims at the Audubon Zoo in New Orleans （新奥尔良奥特朋动物园）. Albino （白化病） gators are ill suited (很难适应）for life in the wild because their pale skin offers little protection from the sun.
Leaf-green pierid butterflies （叶绿色的pierid蝴蝶） alight （降落） on the sandy shores of the Tuichi River in Bolivia's Madidi National Park （玻利维亚曼迪迪国家公园的特赤河). The vast Madidi wilderness (荒原） encompasses （包围） a staggering （交错的） range of ecosystems—from snowcapped Andean peaks （白雪覆盖的安第斯山）to tropical Amazonian lowlands （热带亚马逊低地）.
Jack-o'-lantern mushrooms (空心状的蘑菇） light up the Vermont （佛蒙特州）. The fungi（真菌） glow （发光）green by producing light via a chemical reaction known as bioluminescence. During the day the poisonous mushrooms are yellow-orange.