Another way to earn money is by saving money. For example, if you have a certain budget for buying paper, cut back on how much paper you use by using both sides and talking advantage of other reduction techniques. Use the money left over for eco-friendly products or for field trips. Likewise, you can ask the principal if you can have a portion of the money saved if you conduct a school energy conservation campaign. Find out your school’s average monthly energy use. Conduct an energy conservation campaign and examine energy usage levels after several months. If it’s gone down, it’s money in your classroom pocket.