"Policies

that

encourage

the

use

of

more

efficient

transportation

modes

are

considered

beneficial

in

terms

of

reducing

carbon

dioxide

(CO2)

emissions.

In

support

of

developing

such

policies,

the

impacts

of

various

transportation

demand,

supply,

and

regulation

variables

on

passenger

travel

related

CO2

–

the

predominant

greenhouse

gas

(GHG)

–

emissions

are

investigated.

A

methodology

for

integrating

data

from

multiple

sources

in

a

consistent

manner

is

conceived

and

implemented,

producing

a

dataset

consisting

of

146

of

the

largest

urbanized

areas

in

the

US.

A

preliminary

model

for

CO2

emissions

per

capita

in

terms

of

various

explanatory

variables

in

this

dataset

is

developed,

and

future

improvements

are

suggested."