One day it is too hot and other days it is too cold. Do we need to replace the HVAC system? part of Activities
Monika Kiss, Saint Leo University
This project will allow students to create a mathematical model to help in making decision about replacing HVAC units on a large scale.

A Monarchy Deposed: The Demise of the Monarch Butterfly part of Activities
Daniel Abel, Coastal Carolina University
Monarch butterflies (scientific name: Danaus plexippus) migrate annually to forests in central Mexico from Canada and California. Those surviving the 1200 - 2800 mile migration overwinter in Mexico. In this activity, students will learn about the conservation biology of monarch butterflies, threats to their survival, the implications of their potential extinction, and ways to protect the species.

Population Growth, Ecological Footprints, and Overshoot part of Activities
Rikki Wagstrom, Metropolitan State University
In this activity, students develop and apply linear, exponential, and rational functions to explore past and projected U.S. population growth, carbon footprint trend, ecological overshoot, and effectiveness of hypothetical carbon dioxide reduction initiatives.

Salt Marshes: estimation techniques using basic algebra and geometry part of Activities
Yelena Meadows, Upper Iowa University; Sharareh Nikbakht, Appalachian State University
The activity allows for learning about salt marshes ecosystem and practicing of basic math in estimations.

The Costs of Your Commute: Your Money, Your Time, and the Earth part of Activities
Charlie Buehrle, Harrisburg Area Community College-Harrisburg
This activity has students investigate their own cost, CO2 output, and time for commuting. They then compare their commute to an environmentally conscious alternative by using comparable metrics.

How Big is Your Breakfast Footprint? part of Activities
Ben Galluzzo, Shippensburg University of Pennsylvania
Calculation of a carbon footprint resulting from common breakfast choices illustrates the importance of contextualization.

Arctic Sea Ice Extent part of Activities
Bill Bauldry, Appalachian State University
Student teams investigate Arctic Sea Ice by analyzing actual data and making predictions. A worthwhile extension is to predict the first year that the Arctic Ocean will be ice free.

Estimating OUR Carbon Footprint part of Activities
Ben Galluzzo, Shippensburg University of Pennsylvania; Jean McGivney-Burelle, University of Hartford; Rikki Wagstrom, Metropolitan State University
Description here.

Should I Unplug? part of Activities
Lori Carmack, Salisbury University
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Plastic Waste Production part of Activities
Karen Bliss, Quinnipiac University
In this exercise, students will use data to predict the amount of plastic waste in the next ten years.

How Biodiverse is Lake Superior? An exercise in proportions. part of Activities
Stephanie Kajpust
Students use critical thinking and algebra to measure and evaluate the biodiversity in Lake Superior.

ELIMINATING TRAYS IN THE CAFETERIA: BENEFITS TO THE PLANET AND TO ECONOMIC COSTS part of Activities
Dianne Marquart
In this activity, students will investigate the economic and environmental benefits of eliminating food trays in the cafeteria at their college.

Who Goes There? Estimating Ocean Populations in Chincoteague Bay part of Activities
Maria Hernandez; Itnuit Janovitz-Freireich
In this activity students use data to: rank species on the food chain, compute energy flow ratios and estimate fish populations in the Chincoteague Bay. Students also discuss the impact of the ecosystem and humans on this population, with an extension activity calculating the biodiversity of the system.

How much energy do you save by doubling insulation? part of Activities
Joseph Skufca, Clarkson University
Students will be provided the governing equation for steady state heat transfer across a surface. They will use that equation to explore the effect of changing the insulation value on the amount of energy used.