 With all of these implications in mind, Ehrenfeld explains why, as a result, extinction rates are higher than ever and that the "Sixth Great Extinction” is currently under way, which has created ecological animosity among local and global communities throughout the world.The ideas expressed by him in this book are similar to those exhibited by ecologists Barry Commoner and Jane Jacobs.Ehrenfeld states that the arrogance exhibited by today's society is attributed to humans’ over-dependence on technology to solve environmental and social problems.