With the climate-friendly activities listed on the handout as a guide, ask the students to make lists of other climate-friendly activities.
Advanced students could consider drawing graphs using the data to compare the emissions of each activity and to calculate how many times they do each activity in a given period of time to get an accurate comparison.
Other related resources include this video on how trees could cool down Phoenix, Arizona and this StC lesson plan on urban trees and inequality.
The resource provides a baseline for students to gain practical knowledge in calculation of carbon footprints. Although trees are good sequesters of CO2, educators should note that 22kg/per tree for CO2 being sequestered is relative. It could be more or less depending on the age of the tree, leaf structure, bark, and root structure. This is recommended for teaching.
Quantitative Reasoning: Number and Operations: Fractions (3-5)
5.NF.B.3 Interpret a fraction as division of the numerator by the denominator (a/b = a ÷ b). Solve word problems involving division of whole numbers leading to answers in the form of fractions or mixed numbers (e.g., by using visual fraction models or equations to represent the problem).