Doing some fact checking, you could build automated processing stations on Venus that could process atmospheric CO2 and water vapor (the former is most of Venusian atmosphere and the latter about 20 ppm) into methane and O2. There is plenty of sunlight as a power source too and an abundant source of heat. The gravity well is much worse than the one you find on Mars, but, as far as an automated facility goes, it's conceivable just to leave it there for decades, let it fill itself to its full capacity over decades and just ship a couple tanks coupled to engines to low orbit (or a cycler one) where a passing spacecraft could pick them up. The empty vehicle could then return to Venus and start its cycle again.

Mars is easier, but there is a lot of Carbon on Venus and it would be nice to be able to ship it elsewhere. Maybe then we could somewhat reduce the greenhouse effect and make it more comfortable over a couple hundred thousand years.