ニューヨーク・タイムズのインスタグラム(nytimes) - 8月30日 08時01分

@gabrielleluriephoto captured the leaves of a dead oak tree in Tomales Bay State Park in Marin County, California. At the height of California’s fierce wildfire season, the Sierra Nevada and North Coast forests are choked with tens of millions of dead and dying trees. Scientists say it’s rare that there’s one culprit to blame for the escalation in tree deaths, and the resulting fire hazard. So much destruction is nearly always the result of a number of threats to forest ecosystems. Chief among them in this case: a severe, sustained drought that is stressing trees and disabling their natural defenses. As climate change makes for warmer winters, bark beetle populations are no longer kept in check by winter’s freeze. Separately, a nonnative, potent plant pathogen is thriving in the moist areas of the North Coast. Opportunistic fungi are standing by, ready to finish the kill. Factor in human shortcomings and you have a lethal recipe. Visit the link in our profile to read more.

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