This is a well written article on the topic. It argues that human pressures may be selecting out only the hardiest most adaptable species such as rats, mice, p

This is a well written article on the topic. It argues that human pressures may be selecting out only the hardiest most adaptable species such as rats, mice, pigeons, sparrows, etc... If this goes on unabated, we'll be left with an ecosystem with much lower diversity. http://www.davidquammen.com/sampler/18-planetofweeds http://www.davidquammen.com/sampler/18-planetofweeds