Many scientists claim that global warming is highly related to carbon dioxide. By _____31_____ ones’ carbon footprint—a measure of the impact our daily activities have on the Earth, we can be aware _____32_____ an approximation of carbon dioxide we give off everyday. The unit of carbon footprint could be a kilogram or a ton of carbon dioxide. A carbon footprint is derived _____33_____ summing up the primary footprint and the secondary footprint. The primary footprint _____34_____ our direct emissions of carbon dioxide from the burning of fossil fuels, such as domestic energy consumption and transportation. To compare with the primary footprint, we could have less control on the secondary footprint. The secondary footprint is _____35_____ with the products we use. Everything we consume produces more or less carbon dioxide during its manufacturing and delivering. The more we buy, the more emissions we cause.
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