For an underestimate, the scale is still eye-watering. Between 1960 and 2022, the Nature study suggests invasive species have cost us $2.2 trillion — an annual average of $35 billion. Compare that to ...

Perhaps it was hubris for Rocky Mountain National Park’s founders to name this alpine reserve as if it was the ne plus ultra of a 3,000-mile-long mountain range. Then again, ask anyone to picture the ...