USA

  • Sunrise through an oak-hickory forest canopy at Tyson Research Center, Washington University in St. Louis, Missouri. (Jonathan Myers)
  • The leaves of a sugar maple start to yellow as winter approaches, Tyson Research Center, Washington University in St. Louis, Missouri. (Jonathan Myers)
  • An ornamental cherry tree loses its leaves in the fall at the Tidal Basin, Washington, DC. (Amy Zanne)
  • A frost covered dandelion head spreads as winter arrives at the University of Idaho Arboretum, Moscow, Idaho. (Simon Uribe-Convers)
  • A birch leaf turns a bright yellow as winter approaches, Gateway Arch, St. Louis, Missouri. (Amy Zanne)
  • Maple leaves change colors before they fall in Rock Creek Park, Washington, DC. (Amy Zanne)
  • Early winter brings out the reds and oranges on sugar maple trees at the Gateway Arch, St. Louis, Missouri, USA. (Amy Zanne)
  • Buckeye leaves emerge in the spring after the winter frost at Forest Park, St. Louis, Missouri. (Amy Zanne)
  • Newly emerged tulip poplar leaves in spring after winter frost at Joyce Kilmer Memorial Forest, Robbinsville, North Carolina. (Amy Zanne)

The Study of Plant Evolution

Published December 27, 2013

A new study reveals how plants have evolved to cope with the cold, but as VOA’s Rosanne Skirble reports, these same mechanisms may not provide the same defense against human-induced climate change in a rapidly warming world.


You May Like

Missouri Town Braces for Possible Racial Unrest

Situation in Ferguson hinges on whether white police officer will be indicted for August shooting death of unarmed black teen; decision could come Monday More

Video Ukraine Marks Anniversary of 1930s Deadly Famine

President Poroshenko compares Soviet-era ‘genocide’ to current tactics of pro-Russia rebels in Ukraine's east More

S. Philippines Convictions Elusive 5 Years After Election-related Killings

Officials vowed to deliver justice as the nation marked the anniversary of the country's worst political massacre that left 58 dead, more than half media More