Although it is generally conceded that Venus could not be terraformed by introduction of photosynthetic biota alone, use of photosynthetic organisms to produce oxygen in the atmosphere continues to be a component of other proposed methods of terraforming.

What planets could we terraform?

While Mercury, Venus, Earth, Mars, and even the Moon have been studied in relation to the subject, Mars is usually considered to be the most likely candidate for terraforming.

Is Venus easy to terraform?

Venus is a MUCH harder bet than Mars. While Mars could be terraformed in only a few thousand years, no gently-gently approach could ever work on Venus. ... It would be possible to live on Venus in the high atmosphere, in giant floating cities.