Its abstractness indeed prevented that inwardness from developing into anything , or from originating any special forms , whether cognitive principles or moral laws ; but nevertheless it absolutely refused to accept or indulge anything possessing the character of an externality .
The biggest example of a negative externality is global warming : when we burn carbon-based fuels we benefit ourselves while imposing a great cost on billions of other present and future inhabitants of the planet .
The irony of the legislation is that it forces smokers into what genuinely are public spaces - the pavements outside restaurants and office buildings - and produces a small externality where previously none existed .