General Motors Corp. (GM) said two of its distribution centers achieved landfill-free status.

The Detroit-based auto maker said in a news release its centers in Chicago and Hudson, Wis., have diverted all their waste to recycling or reuse, or converted it into energy.

The centers generate significant amounts of cardboard and wood pallets. The Chicago warehouse alone accumulates 25 tons of cardboard annually.

Both facilities work with local recycling partners to help sort recyclables from other waste, as well as have employees pitching in.

Recyclers can earn rebates for certain commodities. In Chicago, for example, the rebate is about $100 per ton.

GM has a goal of 125 landfill-free sites by 2020.