I agree that a single individuals actions will have minimal impact, but isn't it the individual that makes up the whole?
"Individuals changing their lifestyle isn’t going to accomplish anything."
Why do you say that?
Does any evidence exist that individuals making changes doesn't do anything?
For example, my partner and I no longer own cars, that's hopefully two whole cars off the road for practically a lifetime. Does this have zero impact ?
Also think of it this way, imagine if all of the people in the world right now who couldn't afford to fly, own cars and consume as much as you, could afford to do so and proceeded to do so without thinking about the consequences, it would be 2050 pretty quickly.
I agree legislation and emissions trading schemes etc are important but i don't see it happening fast enough just yet. So why not take some ownership of your own and do your best in the meantime ?