Climate Change: Today, we hear more and more about the effects of "climate change." Scientists tell us there is little doubt that human activities are having a major impact on the atmosphere and ecosystems of our planet. Glaciers and snow packs are melting, stream temperatures are going up, coastal erosion is increasing, and changes in weather patterns are leading to drought and heat waves both locally and regionally. The page linked above provides resources for learning more about the challenges of climate change, and how it will affect our national parks.
Sustainability: Sustainability is about managing the Earth’s resources so they are passed on to future generations of all life in a healthy and abundant manner. Although sustainability has been a major mission in the Parks beginning with the 1916 Organic Act, it is only in recent years that a full fledged commitment and mandate from the NPS has occurred. It touches all aspects of NPS operations: design, policy, management, and interpretation. The page linked above provides resources for learning more about the national parks and sustainability.