Up to 147,800 jobs lost over the next 12 years. Up to $1.1 billion in forfeited tax revenue for state and local governments in that time. In all, up to $141 billion in lost oil and gas production in Colorado by 2030. That is the dire economic forecast often touted by opponents of Proposition 112 — the ballot issue that calls for increasing the minimum distance for new oil and gas wells from homes, schools, rivers and lakes to 2,500 feet — should the measure pass on Nov.