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.

Sustainability Efforts on Our Campus: A Mathematical Analysis part of Activities
Lori Carmack, Salisbury University
In these open-ended but simple activities, students use basic mathematics and descriptive statistics to analyze campus sustainability efforts.

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.

The True Cost of Eggs: Commercial vs. Local part of Activities
Caira Bongers

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.

Simple Population Space Usage part of Activities
Bill Bauldry, Appalachian State University
Students find current values for world and US populations, the area of Texas, and the size of the average house in the USA. Students then look at ratios to assess land usage.

Water conservation part of Activities
Holly Partridge
Small amounts of water in one home dripping from a faucet can add up to huge monetary and resource losses

Shift in life expectancy part of Activities
Holly Partridge
Determining the shift in expected life span over a century and the social and environmental impact

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.

Biking vs Driving part of Activities
Deirdre Smeltzer, Eastern Mennonite University
How much difference would biking to work one day per week make?

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.

Energy Cost of Engine Idling part of Activities
Ben Fusaro, Florida State University
This is an open-ended but elementary modeling exercise about idling energy behaviors and impacts.

Replacing Household Appliances: Refrigerator part of Activities
Krys Stave, University of Nevada-Las Vegas
In this problem, students compare the energy use of their existing refrigerator with a new refrigerator.

Economics of installing Solar PV panels: is it worth it to the individual? part of Activities
Martin Walter, University of Colorado at Boulder
We show that it is economical for an individual to install solar photovoltaic panels in Denver, Colorado; and this is a sustainable strategy for society at large.