and it appears to me as a genuine attempt to point up the difference between what we know is acutally wrong, and what we are prepared to do about it. I agree, there is alot of stuff around, but we are still ignorant, generally, of how bad the sitation is, and how to reduce our own contribution to greenhouse gases.
For some detractors, their reaction is based in "stop making me feel guilty, I don't know what else I can do as my bit", or for others it will be " oh fark awf, I couldn't be arsed changing - I don't look past tomorrow if it is inconvenient to, you bunch of liberally flower-power types." IMVHO.
Don't get me wrong, I'm not an eco-warrior, but do now bike to work when I can (alternate days), never repeat boil, or needlessly boil, a kettle, am prudent with central heating usage, and went on holiday last by train, rather than flew. I know I have slashed my own carbon footprint massively in the last two years or so. And I do see others who can do similar but choose not to. Promotion by concert may help change minds rather than others, like me, getting all pointy-fingered.
I guess also it's an attempt to make being careful about the planet "sexy". There is nothing sexy about low-wattage bulbs, but there are other ways of managing yourself without damaging the environment where we all live. A concert provides an opportunity for politicos to reach a wider, younger audience.