Another possibility, suggested by Bradley C. Edwards, is to put into orbit around Venus a belt of material, blocking a portion of sunlight.
Venus | Venus (mythology) | transit of Venus | Venus Williams | Venus in Furs | Venus de Milo | The Birth of Venus (Botticelli) | Rokeby Venus | List of craters on Venus | Venus of Urbino | Venus figurines | The Birth of Venus | Men Are from Mars, Women Are from Venus | Venus tablet of Ammisaduqa | Venus Raj | Venus Flytrap | Venus flytrap | Venus, Florida | Venus Express | Venus (Bananarama song) | Venus as a Boy | Transit of Venus, 1882 | The Venus Project | ''The Birth of Venus'' | One Touch of Venus | List of geological features on Venus | La Vénus d'Ille | David Teniers the Elder, ''Venus (mythology) | Capitoline Venus | Venus (Shocking Blue song) |