Dietary GHG emissions
Dietary GHG emissions in this sample, estimated in kg of
CO2eq, followed a log-normal distribution. The mean 6 SD
estimated crude GHG impact of diets was 6.3 6 2.5 kg CO2eq/d,
with the diets of women having a lower impact than those of
men (5.9 6 2.2 vs. 6.7 6 2.6 kg/d, respectively). Differences
between women and men were partly driven by differences in
energy intake. The scatterplot in Figure 1 illustrates that, although
GHG impact was positively associated with total reportedreported
energy intake, GHG impact varied substantially at any
level of intake. For instance, at 2000 kcal, emissions ranged
from w2 kg to .12 kg CO2eq/d. The slope of a least squares
linear regression line indicated a mean increase of 3 kg CO2eq/
1000 kcal of dietary energy.