Let’s start with greenhouse gases, the common denominator in most environmental-impact analysis. If you already own a tablet and you’re thinking about using it as a note-taking device, it’s time to retire your ballpoint. According to data from the Environmental Paper Network, producing a single sheet of paper with no recycled content is responsible for the release of about 0.03 pounds of carbon dioxide equivalents into the atmosphere. (A carbon dioxide equivalent is a unit used to express all greenhouse gases, including methane, nitrous oxide and fluorinated gases, in terms of the impact of carbon dioxide.) By contrast, an iPad uses about three watts per hour, which results in the release of 0.004 pounds of carbon dioxide equivalents. That means you could take notes on an iPad for more than seven hours before surpassing the greenhouse gas emissions of a single sheet of paper. Unless you write really, really small, or your professors rarely say anything worth writing down, the tablet wins.
Switching to 100 percent post-consumer recycled paper changes the calculus, but not nearly enough to tip the scales. Producing a sheet of recycled paper releases 0.017 pounds of carbon dioxide equivalents. Given this figure, you could run the iPad for four hours before surpassing the greenhouse gas emissions of this sheet of paper.
But if you plan on purchasing a tablet for the sole purpose of taking notes, the equation changes.
Using an iPad accounts for less than 30 percent of its lifetime greenhouse gas emissions. Manufacturing (60 percent), transport (10 percent), and end-of-life recycling (1 percent) are responsible for the rest. Apple estimates that, over an iPad’s lifetime, the device will account for 231 pounds of carbon dioxide equivalents. (The company doesn’t disclose how many hours of use that includes, only that it assumes “intensive daily use” for three years, which sounds about right for a student with a full course load.) That’s roughly equivalent to the emissions stemming from 7,700 sheets of virgin paper or a whopping 13,600 sheets of 100 percent post-consumer recycled paper.
But paper raises environmental issues beyond greenhouse gas emissions.
Manufacturers are sawing down native trees around the world to make room for eucalyptus trees and loblolly pines. While these species have excellent papermaking fiber and require less bleaching than many native varieties, biology superstar E.O. Wilson estimates that the industrial plantations reduce biodiversity by
90 to 95 percent
. They also require pesticides and herbicides, which can impact water quality. Native forests are being converted to tree farms in the southern United States and at a particularly alarming rate in Indonesia. Office Depot and Staples have agreed not to sell paper products made from unsustainably harvested Indonesian pulp, but your best bet is to buy Forest Stewardship Council-certified paper.
Tablets don’t directly result in deforestation, but they do require rare-earth metals such as coltan that are mined in environmentally (and politically) sensitive areas such as Congo. (In April, several major electronics companies set up rules to prevent revenues from rare-earth metals from funding wars, but it’s not yet clear if that will stop the trade or merely shift the distribution routes.)
In addition, the iPad is just the end-user piece of a massive cloud-computing network. If you’re planning to use such apps as Simplenote or Evernote, you should also consider the environmental impacts of the network as a whole.
The simplest answer to this query is that you shouldn’t buy something you don’t need. So if you already have a tablet, use it for note-taking instead of buying reams of paper. And squeeze as many years as possible out of your tablet before getting a new one. If you’re thinking of buying a tablet just for note-taking, reconsider.
The Earth would be better off if you stuck with recycled paper. You can even get a little creative. Collect all those one-sided printouts your professor gives you — professors still use handouts, don’t they? — and fashion your own notebook out of wastepaper.
The Lantern, which is produced by Slate.com, thanks Joshua Martin of the Environmental Paper Network for help with this column.