A cloud of cedar pollen is seen floating behind a pine tree in Dharmsala, India, Tuesday, October 9, 2018. Each fall the male cedar cones disperse the yellow-green pollen on wind to reach the female cones for pollination. Himalayan cedars known as deodars are native to the Himalaya. (Photo by Ashwini Bhatia/AP Photo)





Autumn colours are seen on foliage at the Botanic gardens in Dublin, Ireland October 4, 2018. (Photo by Clodagh Kilcoyne/Reuters)





Trees covered with hoarfrost and snow are seen on a bank of the Yenisei River as the air temperature drops to about minus 19 degrees of Celsius in Krasnoyarsk region, Russia on November 13, 2018. (Photo by Ilya Naymushin/Reuters)





Strangely shaped, snow covered trees, nicknamed “snow monsters” cover the slopes of Mount Zao on January 19, 2019 near Yamagata, Japan. Mount Zao, a 1,841 high volcano straddling Yamagata and Miyagi Prefectures, is one of the few places in Japan where the phenomenon of “snow monsters” can be seen. Strong winds over the nearby lake fling water droplets which freeze against the trees and their branches until near-horizontal icicles begin to form. Falling snow settles on the ice formations and the end result is a strange figure of a tree. (Photo by Carl Court/Getty Images)





A forest with all fall colors in a plateau during autumn season in in Duzce, Turkey on October 21, 2018. (Photo by Omer Urer/Anadolu Agency/Getty Images)





A view of fireflies at the Santa Clara forest, Tlaxcala State, Mexico, 25 July 2018 (issued 03 August 2018). Santa Clara forest is the only fireflies sanctuary in the country. Countless flickers of light at night mark the mating ritual of the species. (Photo by Hilda Rios/EPA/EFE)





CalFire works in Ventura County as efforts continue against the Thomas Fire in Ojai, California, USA, 09 December 2017. Several fires burning in various locations of Southern California with the Thomas Fire the largest at 148,000 acres (60,000 hectares) burned, forcing hundreds of thousands of people to evacuate as one of the strongest Santa Ana winds forecast of the season have continued for much of the past week. (Photo by John Cetrino/EPA/EFE)





A stereographic projection of the spherical panorama of autumn trees in Ivanovo Region, Russia on October 15, 2018. (Photo by Vladimir Smirnov/TASS)





A lone leaf hangs on a tree at Kahler Asten mountain, western Germany on October 18, 2018. (Photo by Guido Kirchner/DPA)





An autumn leaf hangs on a tree in Sehnde near Hanover, Germany on November 19, 2018. (Photo by Julian Stratenschulte/AFP Photo)





A lamp is seen next to frozen tree branches in Feldberg mountain in the Taunus Mountains near Oberreifenberg, Germany, 22 November 2018. Meteorologist predict for the upcoming days temperatures to stay below zero in the area. (Photo by Armando Babani/EPA/EFE)





A giant baobob tree at the Makuleke contract park, Northern Kruger, South Africa. Some of Africa’s oldest and biggest baobab trees have abruptly died, wholly or in part, in the past decade, according to researchers. (Photo by Tom Richardson Africa/Alamy Stock Photo)





Autumn colour on a maple tree in the Stobbertal nature reserve in Märkisch-Oderland, Germany on October 8, 2018. (Photo by Picture-Alliance/Barcroft Images)





A robin sits on a tinder fungus growing from a tree in the Trettachtal valley near Oberstdorf, southern Germany on April 17, 2018. (Photo by Karl- Josef Hildenbrand/DPA)





A cork oak with its stem resembling a large bird, chosen as the French Tree of the Year in 2018, is pictured in Ghisonaccia on the French Mediterranean island of Corsica on February 14, 2019. This cork oak has been elected as France's Tree of the Year 2018 and will represent France in the 'European Tree of the Year 2019' contest on February 28, 2019. It is estimated to be between 15 and 18 meters high and measures 4,8 meters in circumference. The particular form of its trunk resembling a large bird is believed to have been caused by weather, hence its name “Arbarucellu”, meaning tree-bird in the Corsican language. (Photo by Pascal Pochard-Casabianca/AFP Photo)





Autumn birch leaves are covered with frost in Oy-Mittelberg, southern Germany on November 18, 2018, (Photo by Karl-Josef Hildenbrand/AFP Photo)





The moon shines over the nocturnal plain of the Main at the view of the Altkönig, the third highest mountain in the Taunus at 798.2 meters on September 18, 2018 in Hessen, Kronberg. (Photo by Frank Rumpenhorst/DPA)





Wild bluebells, which bloom around mid-April, turning the forest completely blue, form a carpet in the Hallerbos, also known as the “Blue Forest”, near the Belgian city of Halle, Belgium April 20, 2018. (Photo by Yves Herman/Reuters)





Autumn colours are seen on foliage at the Botanic gardens in Dublin, Ireland, October 4, 2018. (Photo by Clodagh Kilcoyne/Reuters)





Snow covered pine tree reaches for the sky. Shot in Sweden on a crisp winter day. (Photo by Anna Rebecka Lindberg/The Guardian)





Aerial view of the Vosges forest on February 6, 2019 in Oderen, France. (Photo by Sebastien Bozon/AFP Photo)





Wild bluebells blooming turn Hallerbos, a forest also known as the “Blue Forest”, into a blue carpet of flowers near Halle on April 18, 2019. (Photo by Emmanuel Dunand/AFP Photo)





Trees covered with snow are seen after sunset at the mountain resort in Szczyrk, Poland on January 7, 2019. (Photo by Kacper Pempel/Reuters)