Plausibly, you could set up huge arrays of solar panels in sun-drenched regions bordering oceans, and just steadily fill up oil tankers with fuel as the process

Plausibly, you could set up huge arrays of solar panels in sun-drenched regions bordering oceans, and just steadily fill up oil tankers with fuel as the process ran. The only material inputs are atmospheric CO2 and water, (plus catalysts, maintenance, etc.) and any electricity source - sunlight, wind, nuclear - could drive the process.