Do you take plastic bags?
No. Although they are technically recyclable, they would be ruined in a curbside recycling program. They are best avoided. Reusable grocery bags are inexpensive and easy to use - once you have enough to be sure there are always some in the car.
Despite the fact that many grocery bags are recycled, there is little material to recover, relative to the energy required. There is a tremendous amount of energy required to make and deliver them - typically for a single use. (And how many times have you gotten a cereal box double bagged alone?) Additionally, other types of plastic bags are considered contamination, so bread bags, garbage bags, etc cause problems when recycling grocery bags.
The real problem is that they are not photo-degradable, where they would eventually dissolve but rather they break into small flakes and last a very long time. Bags that end up in waterways ultimately come to resemble small bait fish and work their way into the food chain. Plastic that ends up making it to the ocean becomes part of a unique and embarrassing human footprint - the Pacific Garbage Patch (aka, the Pacifc Gyre) Follow here for a real eye opener. (http://science.howstuffworks.com/great-pacific-garbage-patch2.htm). Plastic pieces or various size and density swirl in ocean depths up to 600 feet deep (the furthest tested as I wrote this) - think oceanic snow globe... Mounting evidence suggests that where ocean currents swirl, plastic garbage is present in the center, so other oceans likely share this feature.
While new taxes are always cumbersome and unpopular, Ireland enacted a tax on plastic bags that cut use by over 90% in under a month and raised revenue for other environmental projects. http://news.bbc.co.uk/2/hi/europe/2205419.stm
They are a nuisance and are easily avoided.