Be careful when you recycle a pizza box. Since it is made from corrugated cardboard it seems like something Ithat should be recycled.  Maybe.   

 

While the box itself typically is recyclable, once it gets soiled with grease or food that portion is no longer able to be recycled. In fact, if you recycle paper products, like cardboard, that have grease or food on them you can be doing more harm than good. Contaminated cardboard can ruin an entire batch of recycling. It can even increase the cost of recycling for a municipality because of damage to machinery, disposal costs for the non-recyclable material and wasted time, materials and efficiency. To avoid this problem and do the right thing with your pizza box, you can tear off any portion that has not been touched by food and recycle it. Be sure to tear off any adhesives that may be on the box (i.e. coupons or advertisements) because these can mess up the recycling process just like food.

 

Source:  www.Earth911.com (a really interesting website)