"The lead author of the new paper, Anthony D. Barnosky of the University of California, Berkeley, offered one hopeful note in an interview. He pointed out that while many species are threatened directly and indirectly by human activity, the number actually driven extinct in the last 200 years is estimated to be only 1 to 2 percent of all species on earth.
“We still have almost all the species that we regard as valuable out there to be saved,” Dr. Barnosky said. “We as people have it in our power to do that.”
—”Are We Nearing A Planetary Boundary?,” NY Times, 6 June 2012