Change is a constant in natural landscapes, and it occurs at both large and small scales in these parks. Climate and fire are drivers of large-scale change, while the life cycle of a butterfly or a rockfall from a cliff are examples of change over a shorter time span or a smaller space. Change in these parks may be part of long-term natural cycles, or driven by human impacts such as air pollution, altered fire regimes, invasive non-native species, and climate change. Learn more about the diverse ecosystems and environment of these parks, and processes of change that affect them.