I think it's important to be rational about what will or won't have an impact on the global problem. People want to have a sense of personal agency, but pretending that individual choices like reducing travel, turning the thermostat down and not eating meat will have any impact is actually counterproductive, because they create the false impression that measures short of massive retooling of our economy can make a dent in this problem.

I'm not saying those are bad choices, or that there are not other ethical arguments for them. But let's be clear-eyed about the drastic level of structural change required to stabilize (let alone reduce, let alone get to net-negative) CO2 emissions.

(And anyone who chose to have children is automatically disqualified from talking about individual carbon impacts.)