Lets suppose we wish to raise the atmospheric temps and pressure of Mars.
We want large quantities of Carbon Dioxide to jump-start global warming.
Lets also suppose we have access to some kind of non-linear mass transport…stuff dissapears from one spot and reapears in another without transversing the space in between…boom-tubes, stargates, etc.
Four portals in total: two on the surface of Venus, and two positioned at the Mars ice caps.
The portals are one meter in diameter. The exit portals deliver super-pressurized, hot CO2 directly to the Martian ice caps.
How long before Mars has surface temps and pressure condusive to Earth life?
BONUS…how long until Venus is terraformed by being relieved of excess hot CO2?