In 2010 landfills in the US produced approximately 107.8 Tg CO2 e of methane emi

Question

In 2010 landfills in the US produced approximately 107.8 Tg CO2 e of methane

emissions. Wastewater treatment plants emitted 16.3 Tg CO2 e of methane. (a) How many pounds and

metric tons of methane (reported as CO 2 equivalents) did landfills and wastewater plants emit in

2010? What percent of the total 2010 methane emissions (and greenhouse gas emissions) do these

two sources contribute (total methane emissions in 2010 were 666.5 Tg CO2 e , and total greenhouse

gas emissions in 2010 were 6,821.8 CO 2

Explanation / Answer

1Tg = 2204622621.85 pound

total methane emitted= 107.8 + 16.3 = 124.1 Tg = 273593667371.433 pound

1Tg =1000000 tons

124.1 Tg = 124100000 metric tons

Total methane emission = 666.5Tg

Methane emitted by these two source = 124.1 Tg

% of two sources contribute in methane emission = 666.5 x Y%/100 = 124.1= 18 .619 %

total greenhouse gas emissions = 6,821.8 Tg

% of two sources contribute in greenhouse gas emission = 12410 /6821.8 = 1.819%

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