Stopping migration/immigration from poorer to richer countries would be an even better solution. Stopping all long haul air travel would even be better. If you are being honest you know this will never be solved because no one believes it.
Only instantaneously; integrated over the relevant timescales, the poor countries burn more while industrialising, and everyone (including the poor countries) installs renewables.
I visited Kenya about a decade ago, the taxi was old enough to not have electric windows (so I suspect electric cars will take a while to become affordable for Matatu drivers); there was a geothermal power station.
To actually solve the greenhouse gas problems needs everyone and everything to get greener, including air travel — given how long CO2 stays in the air, if we fixed everything worldwide except rail, that's still 400% of our global greenhouse gas budget.
Aviation is about 19x, cement 30x, livestock and manure 58x; yet all of those combined — rail, air, cement, and livestock & manure — are still only about a tenth of our emissions