Figure 4-5. Expended
Energy
by Category for US
Plastic
Packaging and Substitutes (billion MJ) .....141 Figure 4-6. Expended
Energy
by Category for Canadian
Plastic
Packaging and Substitutes (billion MJ) .142 Figure 4-7. Expended
Energy
as a Percent of Total
Energy
for US
Plastic
Packaging and Substitutes .....142 Figure 4-8.