New Zealand in the 1850s planted millions of Monterey pines for timber, but the invasive trees now threaten native mountain landscapes despite costly control efforts

When we see pictures of pristine mountain landscapes, we often picture untouched wilderness. We imagine rolling fields of native tussock grass waving gently under crisp blue skies, rare alpine flowers blooming in isolated rock crevices, and unique local ecosystems thriving precisely as they have for thousands of years.

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