Just curious, if flying's contribution to "observed human-caused climate change to date" is overrepresented (4%) compared to its share of global emissions (2.4%

Just curious, if flying's contribution to "observed human-caused climate change to date" is overrepresented (4%) compared to its share of global emissions (2.4%), then what is/are the activity or activites that are underrepresented? Like, what generates lots of emissions but is a much smaller deal in terms of climate change?