Skipping the dryer in your laundry routine for even 6 months out of the year can prevent the emission of 700 pounds of carbon dioxide. If that weren't enough of a reason to line-dry, your clothes smell better when you do, and you reduce the risk of dryer fires.
This collapsible wooden drying rack from Abundant Earth is made from rescued mill ends that would otherwise be chipped and burned, the wood harvested sustainably from second growth forests in the first place.
Also, for an eco-friendly double-punch, Maggie's Soap Nuts are the dried fruit of the Chinese Soapberry tree containing saponin, a natural cleaner.
These can be used in place of conventional laundry detergent by putting the Soap Nuts in a cotton sack, and dropping the sack in with your laundry. Harvesting the berries of the Soapberry tree provides a disincentive for cutting the trees down for firewood.
With either conventional or natural cleaners, line-drying can result in 2D clothing. Stiff clothes can be avoided by adding 1/2 cup of vinegar to the washer.