How one 90-year ecological mystery reveals the complexities of conservation—and the problems with the “endangered species” approach.

What do suburban neighborhood spats, climate activism, and Indigenous traditions have in common? They’re all feeding into a growing movement to grant trees legal rights.

These garden shrubs, among others, have been known to spread Sudden Oak Death. The government is ill prepared to prevent an outbreak.

The Covid-19 emissions paradox reveals the adjustments we have to make to fight climate change.

The memoir of a professional tree-climber reveals the agony and the ecstasy of life at the top of the world.