The personal carbon footprint is just a dodge for the elite, a way to push the problem off onto us rubes. The reality is that the producers have far more power over CO2 output than consumers ever will. "Let the market decide" does not work with large, hugely imbalanced indirect externalities.
"the corporations" have spent hundreds of millions in marketing and advertising pushing the idea of a personal carbon footprint. Just so we can point our fingers at eachother rather than them.