Wheat harvests at higher latitudes (such as shown here in the Akershus region of Norway) may get at least a temporary boost from more CO2, but climate change will stress crops across many parts of the globe, especially in the tropics. (Øyvind Holmstad/Wikimedia Commons)

Projected changes in crop yield as a function of time, with and without adaptation, incorporating more than 1000 studies from across the world. For each time interval, each colored slice indicates the percentage of studies for that interval showing a given change in crop yields. (IPCC)

Data collected by NASA satellites between 1982 and 2011 reveals trends in vegetation across higher northern latitudes. Between 34% and 41% of vegetation-supportive terrain showed an increase in plant growth (green and blue), while 3%–5% showed a decrease (orange and red). (NASA Goddard Space Flight Center Scientific Visualization Studio)

Visitors inspect the FACE experiment site at the Justus Liebig University in Giessen, Germany. (Mohammad Zaman/International Atomic Energy Agency)

(Pete Markham/Wikimedia Commons)

A wildland fire rages in the forest behind Great Sand Dunes National Park in southern Colorado on June 23, 2010. Many researchers expect such fires to become more frequent and severe as the planet warms. (UCAR Digital Image Library, photo by David Hosansky)

Trees in the Rocky Mountains near Granby, Colorado, show the effects of an attack by the mountain pine beetle. (Carlye Calvin)

(Agricultural Research Service, USDA)

In Central America, malaria is often transmitted by the mosquito species Anopheles albimanus. (James Gathany, U.S. Centers for Disease Control and Prevention)

The mountain-dwelling American pika is already being challenged by rising temperatures. (Walter Siegmund/Wikimedia Commons)

The Apollo, one of many butterfly species being pushed to higher altitudes by warming temperatures. (Wenkbrauwalbatros/Wikimedia Commons)

Golden toads were wiped out by a fungal disease during a La Niña spring in Costa Rica. (Charles H. Smith, U.S. Fish and Wildlife Service)