Based on Frito-Lay North America: The Making of a Net Zero Snack Chip, and Corporate Greenhouse Gas Accounting: Carbon Footprint Analysis - for the Casa Grande facility only 1. how can I calculate the metric tons of emissions of greenhouse gases from electricity (but not purchased steam) and natural gas usage (but not coal, fuel oil, gasoline, diesel or refrigerants)separatelyfor each year from 2002 to 2007 2. break out the carbon footprint for each Greenhouse Gas Protocol FULL CASE FOR ADDED REF: https://saylordotorg.github.io/text_sustainability-innovation-and-entrepreneurship/s09-03-frito-lay-north-america-the-ma.html