Units converter for Microsoft Excel

Download this spreadsheet and copy the ‘units’ tab into your own spreadsheet to make units conversions transparent. For example, enter the formula

    =1000*BtuTOkWh

to convert 1,000 Btu into units of kWh (producing the result 0.293).

Interaction of emission reduction mechanisms

If you are implementing two emission reduction mechanisms that each cause a fractional emission reduction of r1and r2 respectively, then what is the fractional reduction r1+2 caused by both together? The answer it turns out is

r1+2 = r1 + r2 – r1r2.

Read this note on interactions (272KB PDF) to understand why.