the color of rivers seen from space may provide a better index of the health of rivers than simple visual observations from land
When we lose birds, we are witnessing the continued unraveling of nature that will leave behind a less healthy and impoverished world for the future.
We will spare nature by living in cities, but for a sustainable world, we will not pull ourselves up by our own bootstraps by living in cities.
Future generations will have no escape from the pressure of their own numbers and the stresses of a full planet.
The wall has costs—cultural costs for reductions in biodiversity that are the heritage of the desert Southwest.
Humans are the largest force shaping the surface of the Earth today.