The average global temperature is currently around 14 degrees Celsius. If we add 3 degrees Celsius to this, we would have an Earth temperature of 17 degrees Celsius after global warming.

If a rogue ice planet named Temperatus were to experience global warming of 280 degrees Celsius, it would result in an extremely high temperature on the planet. This level of warming would likely be catastrophic and render the planet uninhabitable for most forms of life, including humans. It is important to note that such extreme temperature changes are not observed on Earth and are highly unlikely to occur naturally.

If Temperatus were to become a habitable rogue planet with oceans, continents, and bioluminescent life, it would indeed be a fascinating and unique environment. Resembling Venus, which has a thick atmosphere mainly composed of carbon dioxide, Temperatus would likely have a similar feature. The bioluminescent life would be an interesting adaptation to the extreme conditions of Temperatus. Creatures on this planet might have developed bioluminescence as a means of communication, camouflage, or attracting prey or mates in the low-light environments. The oceans would likely be highly acidic due to the presence of carbon dioxide and other gases in the atmosphere, similar to Venus's atmosphere, which would impose specific challenges for marine life to adapt to and survive. Overall, the habitability of this fictional rogue planet would significantly depend on various factors such as the composition of its atmosphere, the ability of life forms to withstand extreme temperatures and acidic conditions, availability of water, and numerous other factors.