Does the company you're employed at always happily give you how many extra days you need to take a boat or to ride a train instead of taking a plane? Lucky you, I can promise you that's not the case everywhere.
Like sure, you could insist on taking the cleanest transportation method available but that's definitely putting yourself on the chopping block and while starving to death due to not having income definitely is very climate friendly overall (less humans = less negative impact on climate after all) I really hope you can see yourself why this isn't actually a proper solution. Unless you want to see humanity go extinct but in that case might as well also continue the way we have so far.