Repeated periods of heat and drought causing some trees to die – study

Researchers in the Netherlands find climate change is increasing vulnerability of some speciesClimate change is causing apparently healthy trees to die after periods of heat and drought. Many may not die immediately but repeated periods of hot weather seem to increase the vulnerability of some species more than others.Researchers studied 20 species of conifers planted 100 years ago in the same place in the Netherlands, taking tree ring samples to see how they did in droughts between 1970 and 201