When we lose a species, the bell tolls for us.
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.
We must look beyond the self-centered view that we are the only masters of our own survival.
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.
[We need] a report card that grades plant production, soil organic matter, biodiversity and nutrient balance against our best measures of what they would be in a world without humans.
What good is a butterfly that does not tweet or titillate?
If low levels of insecticides, many of them endocrine disruptors, are involved, humans are certainly exposed as well
No program exists to predict the potential for new species—plant or animal–to become invasive upon arrival in the U.S.