The second article gives some comparison to individual emissions. Another way to look at it though, if Jeff's space trip to generate (to pull numbers out of the air) 1000x the average annual output of an individual then controlling a single point is going to be far more practical than attempting to get 1000 others to do what is needed to offset it PLUS whatever amounts needed to have a net reduction. There's been a commonly floated stat that 100 companies are responsible for the majority of global emissions, getting those 100 to reduce their output by half is going to be a lot simpler and have a larger impact overall than to try and coordinate the 7B+ people on the planet.
Doing your own actions sets a good example and is good practice, but a tiny dot in the global scale of things compared to things like travel and industrial output.
To dispute to 100 entitites part, is above which seems viable too. On net though, to look at it in a simplified manner I've never launched a rocket to space, but for that to be offset would take the collective action of a sizable number of people.