This is completely incorrect. Aviation contributes 2.5% of global emissions (but is terrible on a per capita basis, as only around 10% of the world's population travels on any given year). Global shipping accounts for 2.3% of global human-made emissions [1].

In transport emissions, passenger vehicles dominate by far (with around 12% of global GHG emissions), even more so in developed countries. Then freight by road with 7.5% of total emissions.

Maritime shipping is actually the least carbon intensive way to transport goods over long distances by at least two orders of magnitude [2].

[1] https://ourworldindata.org/co2-emissions-from-transport

[2] https://www.ipcc.ch/report/ar5/wg3/transport/06_figure_8-6/