1. The problem statement, all variables and given/known data Using the above result, estimate the annual CO2 emission savings (in kg/yr) associated with replacing one 60W incandescent bulb with one 13W fluorescent bulb, in one typical Canadian household. Do this calculation from “first principles” using the following assumptions: (The "above result" was the answer to "How many hours per day must the replacement and original light bulb be left switched on (on average over the year) to save a certain amount of money per house". The answer was found to be 4 hours) - The GHG savings are entirely CO2 and result from the reduced combustion of fossil fuels in electric power plants.Canada’s electrical power generation mix is 23 % from fossil fuels. Assume electricity from other sources (hydro, nuclear and renewable) have approximately zero carbon emissions. The carbon intensity of this fossil fuel usage is 22 g/MJ - Assume the overall efficiency for the fuel energy to electrical power conversion process is 35 % - Most light bulbs are located indoors, in an occupied living space. So, the net carbon emissions savings will be approximately zero for six months of the year. 2. Relevant equations 3. The attempt at a solution Is the answer: so (60-13)= 47W worth of carbon emissions is saved by replacing the bulbs, 47W=47 j/s so 47 j/s * (4hours*3600)s * 22(g /MJ) * (1MJ/10^6J) = 14.9g since carbon savings is zero for half the year, then 14.9/2 = 7.45g? I'm not sure where to use the info of 35% or 23%?