The "Preserve" plastic razors are made from 100% recycled plastics (in the handle), 65% of which is harvested from old Stonyfield Farm yogurt cups. If your local recycler takes #5 plastics you can drop it off there when you're done with it; otherwise Recycline, the manufacturer, will provide you with a postage-paid mailer with which to return the razor.
A four-pack of razors costs $7.25 from the Preserve store, which isn't too bad for disposable razors. Better, you can also just buy replacement blades from Preserve. That would obviously be the most conservative tack.