In the span of a week, Americans witnessed two important days – Tax Day on April 15th, and Earth Day on April 22nd. While we saw many celebrations on Earth Day, on the infamous day that tax forms are due, moods were likely less cheerful as individuals throughout the country struggled to understand and complete a myriad of tax forms. However, perhaps the close proximity of these two important days is appropriate: taxes do play a crucial role in many environmental finance systems. For that reason, at this time of year I often try to relieve my form-fatigue with some reflection on the role taxes play in paying for environmental programs.