Successful Species?

Who says we are a successful species,
Must be some idiot's half baked thesis,
We all know that what is very adaptable,
Is going to make it in the long pull.
Like roaches and sharks have been around,
A lot longer than man has been found,
In traces of ancient biology,
In the forests, deserts, and mighty sea.
Is man too delicate a one,
To meet the challenges yet to come,
Of contamination and pollution,
For which the authorities have no solution?
Yes King Rat may rein on yet,
And the roach and shark don't forget,
Nature gives them successful adaptation,
While we give ourselves lethal radiation.