On the surface, libertarianism is pretty attractive.  Who wants government or any other authority telling us what to do?  The premise that acting in our own best interests, whether it be providing a service or selling a desired product is good for all is hard to refute.... Except when these efforts denigrate the commons we all depend on (the air we breath, clean water, etc.).  Libertarianism, in many ways, personified the 19th and 20th centuries up to the onset of badly needed environmental protection laws, creating countless disasters.  Until Libertarians can reconcile this fatal flaw in their philosophy, they have no place in a finite world with a rapidly expanding population.