# 98.213 Calculating GHG emissions.
You must determine CO<sub>2</sub> process emissions from carbonate use in accordance with the procedures specified in either paragraphs (a) or (b) of this section.
(a) Calculate the process emissions of CO<sub>2</sub> using calcination fractions with Equation U-1 of this section.
Where:
E<sub>CO2</sub> = Annual CO<sub>2</sub> mass emissions from consumption of carbonates (metric tons).
M<sub>i</sub> = Annual mass of carbonate type i consumed (tons).
EF<sub>i</sub> = Emission factor for the carbonate type i, as specified in Table U-1 to this subpart, metric tons CO<sub>2</sub>/metric ton carbonate consumed.
F<sub>i</sub> = Fraction calcination achieved for each particular carbonate type i (decimal fraction). As an alternative to measuring the calcination fraction, a value of 1.0 can be used.
n = Number of carbonate types.
2000/2205 = Conversion factor to convert tons to metric tons.
(b) Calculate the process emissions of CO<sub>2</sub> using actual mass of output carbonates with Equation U-2 of this section.
Where:
E<sub>CO2</sub> = Annual CO<sub>2</sub> mass emissions from consumption of carbonates (metric tons).
M<sub>k</sub> = Annual mass of input carbonate type k (tons).
EF<sub>k</sub> = Emission factor for the carbonate type k, as specified in Table U-1 of this subpart (metric tons CO<sub>2</sub>/metric ton carbonate input).
M<sub>j</sub> = Annual mass of output carbonate type j (tons).
EF<sub>j</sub> = Emission factor for the output carbonate type j, as specified in Table U-1 of this subpart (metric tons CO<sub>2</sub>/metric ton carbonate input).
m = Number of input carbonate types.
n = Number of output carbonate types.