TAURUS (April 20-May 20): Three billion years ago, the Earth’s original single-cell organisms thrived in a carbon dioxide-rich atmosphere. As a byproduct of their metabolism, however, they released an abundant amount of oxygen. It was a pollutant that ultimately made their environment uninhabitable for them, though it prepared the way for the oxygen-breathers that now dominate the planet. Now let’s meditate on how this might be a useful metaphor for you, Taurus. Is there any “pollutant” produced by the person you were in the past that could be valuable for the person you will become in the future?