Heat, drought and an invasive grass are driving wildfires killing the giant saguaros in Arizona, raising concerns about how the cactus will recover without human intervention.
The hardy cactus - fond of heat and aridity, adapted to rough soils - might not seem like the picture of a climate change victim. Yet even these prickly survivors may be reaching their limits.
A changing climate is raising concerns about how the saguaro will survive the 21st century in an environment that's hot and getting hotter, dry and getting drier.
Deserts might be renowned for their arid and hostile characteristics, but they are home to some incredible plants that have developed strategies to find and use the last droplet of water.
