The argument they all share is incremental behaviour change and awareness raising will reduce the rampant consumerism. Which I guess is my personal ethos too. But I know so many people who don't believe that changes in their own behaviour will actually make any difference. My favourite economists, Freakonomics, did a fantastic podcast about the "slow food" movement. In it, they show evidence that bending over backwards to make sure that you only eat produce from within 100 miles of where you are has a negligible impact on your carbon emissions, and that when you weigh it up, you are doing more overall good in buying grapes from a Chilean farmer than not.
I think it's important for people to take control of your consumption and make informed decisions about it. It's everyone's responsibility to consider the impact of their lifestyle. It is empowering to make decisions and take steps to reduce energy consumption and waste - to not believe this makes you feel helpless. But let's not forget that the real perpetrators are corporations and governments. While personal responsibility is something I will always support, let's also make sure our responsibility is to trying to effect big change.