ccsp product 2 draft for public review september 2006 7 1 chapter transportation lead author david l greene 3 4 oak ridge national laboratory 5 6 key findings 8 the sector of north america released 587 mt c into atmosphere in 2003 nearly 9 all form carbon dioxide from combustion fossil fuels this comprises 37 total co 10 emissions worldwide activity which turn accounts about 22 global 11 12 energy use and associated have grown 13 substantially relatively steadily over past 40 years growth has been most rapid mexico 14 country dependent upon road transport 15 by are determined levels passenger freight 16 shares modes intensity movements 17 is driven population 18 per capita income economic output 19 chiefly as a result american
