Connectivity Options: Going Mobile
The best eReaders are compact and lightweight, making them convenient to take with you anywhere. They should be easy and comfortable to hold for an extended period of time. In addition, all eReaders have Wi-Fi connectivity, and some models offer free domestic 3G data. Devices with 3G data are noticeably more expensive than Wi-Fi-only eBook readers, but if you travel a lot and don't always have access to a reliable wireless internet connection, data is a fast way to buy and download new eBooks.
If you love to read but hate lugging books around with you, a dedicated eBook reader can make reading your favorite novels and other content convenient and enjoyable – anytime, anywhere. The best eBook readers in our reviews balanced reader-friendly features with designs optimized for mobility.
Apple’s generates 130 kg of carbon dioxide equivalents during its lifetime, according to company estimates. Amazon has not released numbers for the Kindle, but independent analysts put it at 168 kg. Those analyses do not indicate how much additional carbon is generated per book read (as a result of the energy required to host the e-bookstore’s servers and power the screen while you read), but they do include the full cost of manufacture, which likely accounts for the lion’s share of emissions. (The iPad uses just three watts of electricity while you’re reading, far less than most light bulbs.) If we can trust those numbers, then, the iPad pays for its CO2 emissions about one third-of the way through your 18th book. You’d need to get halfway into your 23rd book on Kindle to get out of the environmental red.