Which materials are difficult to recycle?

Our rubbish, or waste, can be a threat to the environment. Recycling our waste is one way that we can help to protect the environment. Recycling is converting waste into reusable material. An example is when a product is melted so that the material can be used to make new products. Most products can be recycled...although not all of them. You are probably familiar with recycling household waste such as bottles, cans and paper.