Currently, households are major emitters of the world's greenhouse gases (GHGs), given the massive amounts of energy that are consumed to fulfill residential demand (Ala-Mantila et al., 2014;Wiedenhofer et al., 2017). In fact, nearly one-third of global carbon dioxide (CO 2 ) emissions, which are the largest component of GHGs, can be attributed to households (Wei et al., 2007). On the other hand, household consumption is complicated, diverse, and highly behavior-driven, which implies that the household sector could be the source of a considerable reduction in GHGs. Taking the household GHG emissions of the United Kingdom as an example, 37% of a future decrease in the UK's emissions can be achieved within its household sector, implying that households consume far more than is needed (Druckman & Jackson, 2010). The large share sees the household sector recognized as the most promising area for meeting various reduction targets. The Intergovernmental Panel on Climate Change (IPCC) emphasized, for example, that the modification of household consumption is necessary if the world is to meet the 1.5-degree mitigation target it has set (IPCC, 2014). Similarly, in the intended nationally determined contribution (NDCs) of Japan, the household sector has been called on to decrease nearly 40% of its CO 2 emissions by 2030 in terms of its 2013 levels (UNFCCC, 2015). Given its enormous contribution to GHG emissions, as well as its potential for significantly reducing them, the way that we can best promote household efforts to help climate change mitigation has become a vital issue for most countries across the world (Aune et al., 2016;Shigetomi et al., 2018). However, households are the largest final consumption source, and their consumption is not just measured by direct fuel combustion, but also by the indirect emissions released in the supply chain. As a result, that