Why are scope 3 emissions so hard to measure?

According to Lars Schedin, calculations show that up to 90 % of carbon emissions are Scope 3. Governments acknowledge the difficulties in accurately measuring these and examining the current accounting standard of the Green House Gas Protocol highlights the complexity companies face when accounting for these types of value chain emissions. This presentation examines how practical methodologies that accurately and transparently measure Data Center facilities can lower its Scope 3 emissions and significantly reduce its carbon footprint