Presidential primary season showcases the different voting methods that are out there—caucuses, electronic ballot, paper ballot, absentee voting, and online voting. We know some of these systems are more secure than others, but which is the greenest way to hold an election?
No analyst has ever calculated the full environmental impact of an election, or even of a single vote, so it’s difficult to say much with certainty about green voting practices. One thing seems clear, however: The largest impacts of an election don’t come from voters’ putting pen to ballot, or their fingers to a glowing touch screen. As with so many activities in American life, 90 percent of the damage we do to the environment comes just from showing up. If you drive to the nearest polling place, it hardly matters how you cast your vote, because your car will affect the climate more than any voting machine.
Distance to polling places varies tremendously across the country, and the Lantern is not aware of any study venturing a guess at an average distance. Let’s assume, for the sake of analysis, that a voter travels just one mile to the polling place in the country’s most popular car, which happens to be the Ford F-150 pickup. The vehicle gets 16 mpg in the city and 23 on the highway, so the two-mile round trip to the polls might burn up one-10th of a gallon of gas, which would produce approximately two pounds of carbon dioxide.
How does that compare with voting by mail? A 2008 study (PDF) by document services company Pitney Bowes estimated that mailing a letter accounts for approximately 0.055 pounds of carbon dioxide equivalent. Driving to the polling place, therefore, generates about 18 times as much greenhouse gas as does an absentee ballot on its round trip between the state election commission and your door. So, unless you can walk to your polling place, it’s better for the planet to mail in a vote than to cast it in person.
If you can’t drop your ballot in the mailbox, then the question comes down to whether it’s greener to vote on an electronic touch-screen machines or via paper ballots, which are usually counted by an optical scanner.
Let’s start with the paper. According to the Environmental Paper Network, one ton of ordinary copy-quality paper generates 6,023 pounds of carbon dioxide equivalents. Since there are approximately 200,000 sheets of paper in a ton, each sheet is responsible for about 0.03 pounds of carbon dioxide.
The industrial scanner used to tally the paper ballots doesn’t add much more. Such devices typically consume about 0.2 kilowatts while in use. Even if it took the machine a full five seconds to process a single ballot, we’re only talking about 0.0003 kilowatt-hours of juice and 0.0004 pounds of carbon dioxide. Let’s call that a rounding error, and say that paper ballots cost about 0.03 pounds of carbon dioxide per vote.
Paperless voting systems amount to specialized desktop computers, which also consume about 0.2 kilowatts of electricity while in use. Unlike the optical scanners, however, the touch screens typically run continuously during a 12-hour voting day, whether or not a voter is present. If 100 voters used the machine over the stretch, then each vote would be responsible for 0.024 kilowatt-hours of electricity and 0.03 pounds of carbon dioxide—the same as the paper ballot.
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