IMHO, this can be one of two very different questions.
One question is, what would I do in the world as it currently is, just on my own and not as part of any sort of national comprehensive plan?
The other is, what would I be willing to do as part of a more global plan to address consumption leading to global warming?
As an individual, with no expectation of being part of a larger approach, I’m already:
Small effect: recycling, using energy efficient appliances, buying fewer things, and at least somewhat lowering the room temperature. Car pooling is moot because my commute these days is from the living room and kitchen to the spare bedroom where my desk is.
Medium effect: I’ve had heat pump heating and cooling for the past quarter-century, and at a couple stops before that. I have no idea why heat pump use isn’t much more the norm in the U.S. No way I’m going to a vegetarian diet, but I’d point out that among animal protein sources, beef is by far the most environmentally problematic, and we’ve all but phased beef out of our diet on account of that. And someone would have to explain to me why organic food puts less carbon and/or methane into the atmosphere than conventional agriculture. (Is ‘organic’ even a well-defined term with respect to food labeling standards?)
Large effect: Giving up my car is not feasible. I’d be happy to buy my power from a renewables-only provider if I knew for sure that it was actually resulting in a higher proportion of electricity being produced by renewables, rather than just changing who pays for which electrons. And what’s the deal with ‘long’ plane flights? How long is long? And why is there a special benefit for cutting out ‘long’ flights? Aren’t takeoffs and landings the most energy-intensive part of any flight?
When I’m acting on my own, this shit has to be explained to me.
I’d do a lot more if I were acting within some comprehensive program. I think it would be great to fully price in the carbon and methane contribution of different foods, so that people would treat more environmentally questionable foods as luxury items, or switch altogether to more climate-friendly alternatives. I don’t know if I would go wholly vegetarian and I doubt I’d go vegan, but it would certainly push my choices further in that direction.
Similarly with car ownership and avoiding plane flights. We need far better public transportation, both within and between urban areas. Europe and Japan have 200 mph trains, why the fuck don’t we? Are we some fucking backwater? And we need a national housing policy so that more, denser housing is available in and near downtowns. There’s no need to herd people back into the cities; housing in many U.S. cities is expensive because - duh! - more people want to live there than there is housing for. But zoning seems to trump any attempt to mitigate this. The free market can’t provide sufficient housing because the sort of government regulation you never see conservatives protesting against prevents the free market from working.
Sure, I’ll give up my car in a world where it’s not a big deal to get around without one. And my wife and I will stop taking the plane from DC/Baltimore to Tampa when we can hop on a 200 mph bullet train and be there in four hours, rather than taking two days each way by car. Because time is a precious resource.
We really do need systemic changes to address global warming. Individual choices are nice, but they’re not going to move the needle much unless governmental action makes it natural for individuals to make better, more climate-friendly decisions, especially in the ‘large effect’ bucket.
End of rant.