Gabriella Cardenas of North Potomac, Md., wears her quinceañera dress as she and her father, Boris Cardenas (holding the dress), brother Jason Cardenas and mother Patty Cardenas move to a new spot along the Tidal Basin for a photo. Tyrone Turner/WAMU hide caption
This image provided by Vinal Applebee shows the home of Lisa Gorman in the foreground, the poisoned oak trees behind her home, and the home of the alleged perpetrators behind the dead trees, in Camden, Maine. Courtesy Vinal Applebee/AP hide caption
Research has found that trees contribute to the formation of clouds, which reflect heat from the sun and cool the atmosphere in the immediate area. Dan Kitwood/Getty Images hide caption
The massive trunk and crown of the Sycamore Gap tree will be moved from the spot where it fell along Hadrian's Wall in England's north east. Police have made two arrests in the felling of the historic tree. Jeff J Mitchell/Getty Images hide caption
Yevgeniy Medvedovskiy, the chief of the Zhytomyr region's department of ecological inspection, walks around the site of the jet crash picking up shards of metal and looking at the fallen trees. Claire Harbage/NPR hide caption
Viktor Radushinskiy, a member of Ukraine's forestry department in Zhytomyr, looks at a site in the northern Ukrainian woods where a fighter jet crashed. Claire Harbage/NPR hide caption
Coastal Redwood Trees Justin Sullivan/Getty Images hide caption
Beech trees seen from the forest floor. This image was taken in a forest named Bøkeskogen in Larvik city, Norway. Baac3nes/Getty Images hide caption
The roots of mangrove trees grow above and below the water's edge. Dulyanut Swdp/Getty Images hide caption
Firefighters wrapped foil around the base of the General Sherman tree to protect the gigantic sequoia from an intense wildfire. Sequoia & Kings Canyon National Parks hide caption
Crazy worms — an invasive species from Asia — pose a threat to forests, scientists say. The worms can thrash around so violently that they can jump out of a person's hand. They also lose their tail — on purpose. Josef Görres/Plant and Soil Science Department University of Vermont hide caption
The red-cockaded woodpecker has been listed as endangered for more than half a century. Chuck Hess/USFS hide caption
These days only park rangers and loggers are allowed in to Big Basin Redwoods State Park following a devastating wildfire that destroyed most of the infrastructure in California's oldest and one of its most iconic state parks. Big Basin is home to the largest continuous stand of ancient coastal redwoods south of San Francisco. Eric Westervelt/NPR hide caption
This tree-planting photo was submitted with an application for a gun license in Ferozepur, a city in India's Punjab state. Courtesy of the Deputy Commissioner of Ferozepur District hide caption
Some cottonwood trees are home to microorganisms that are known methane producers. Sean Bagshaw/Science Source/Getty Images hide caption
A support structure braces a tree for the strong Siberian winds in Pyeongchang during the 2018 Winter Olympic Games. Francois-Xavier Marit/AFP/Getty Images hide caption
The historic Jackson Magnolia, planted on the south grounds of the White House, was trimmed back on Wednesday. The tree is in poor health, needs artificial support and is in danger of falling. Andrew Harnik/AP hide caption
The Sardar Sweet Shop in Varanasi, India, was built around a neem tree considered too holy to cut down. Customers flow in and out, barely noticing the imposing tree. In rural parts, people use the neem tree's leaves to repel insects, the sap for stomach pain and the branches to brush their teeth. As for the candy shop sweets, Diane Cook says they were "fabulous." Diane Cook and Len Jenshel hide caption
A red oak in Washington, D.C., that's estimated to have started its life in 1692 developed a fatal crack in its trunk. Dana Ju/via WAMU hide caption
People walk along the "Avenue of the Baobabs," a natural reserve in western Madagascar, in 2011. AFP/Getty Images hide caption
The deadly incident happened at Ghana's Kintampo Falls, pictured here in 2011. benketaro/Flickr hide caption
Chris Morris, an experienced back country skier, cuts back in a glade on Lyon Mountain in upstate New York. Brian Mann/NCPR hide caption
A mango seedling can — after a few years — bear economically beneficial fruit. Claudiad/Getty Images/Vetta hide caption
Giant sequoias in the Sierra Nevada range can grow to be 250 feet tall — or more. John Buie/Flickr hide caption