@AlMcAlMcAl tweeted a link to these cool maps from Berkeley's Cool Climate website. It shows average household carbon emissions by ZIP Code. Values for Ann Arbor range from about 43 Metric Tons CO2 equivalent in 48104 to about 55 MT CO2 Eq. for 48103. U of M's ZIP, 48109 has super low average emissions at just 21 MT CO2 Eq.