On average how much oil does our nation consume in a year?On average what is the national yearly usage of fossil fuels from industrial and commercial processes?As fossil fuels are used to produce energy what is the estimated percentage of natural gas used by an average American to produce electricity?What is one important assumption of the calculator?One of the various information needed to know in order to properly use the calculator is the _____________What are the categories of public transportation used by the online calculator?Based on the online calculator what is the crude oil usage for a family of 4 which drives the car for 10000 miles at 20 mpg uses 20 gallons of gasoline to power the mower through the mowing season and uses 12000 KWh of electricity in a year?As an estimate how much electricity could be saved in a year if the average home switches all incandescent light bulbs to fluorescent light bulbs?On average our nation consumes _________ cubic feet of natural gas each day.Why is the activity considering only some direct usage of fossil fuels instead of computing the total of direct and indirect uses?