Topic: Calculate the amount of electricity you use for a day on the weekend, guess the amount of coal energy and CO2 emissions - The amount of electricity (electric energy) you use per day (cell phone, PC, light, TV, etc.) - Assuming power plant efficiency (eg 35\%), estimate the amount of coal used for electricity production per day (refer to various Internet references) - Prediction of the amount of CO2 generated at this time - Prediction of the amount of CO2 that can be reduced by lifestyle changes