I am definitely a contributor. It is a serious issue. I tell myself I'm not the worst offender, and that is certainly true. I rarely drive. Instead, I walk most places or take public transit. I take the train where possible. I do eat red meat -- but very little of it, and all of that locally raised on small farms. Yes, I shop online (delivery is an environmental issue) but now that I live in a centre with bricks and mortar stores, I shop in person more. I also shop more at second-hand stores now, and at small local designers. And a longer term goal is to reduce my consumption.
Even so, I fly several times a year, minimum. For work and for family visits mostly—but also, occasionally, for a holiday.
A friend of mine is extremely involved in environmental efforts. She is still flying, but she pays carbon offsets to (partly) assuage her guilt. There are plenty of arguments pro and con.
https://www.bbc.com/news/business-48657582
https://www.ontheluce.com/carb.....g-flights/
My friend has the means to do this -- not everyone does, of course, and some people need to travel for work. Even then, more and more are refusing and saying they will meet online instead. For some projects/ companies/ situations/ that works. For others, not so much.
As for me, given my personal situation with family all over the world and work that also involves travel, flying is pretty much a given.