pollution
It can be expensive and harmful to the environment. ......
Nondegradeable resources
Polyurethane is a synthetic material that can be used in many different ways. For the most part, this substance is not harmful, but sometimes this substance can produce harmful chemicals such as carbon monoxide. Handling the substance at high temperatures can be toxic. http://www.ehow.com/about_4607738_what-is-polyurethane.html
Not much, asbestos has an amazing hear resistant property, when super heated, to over 2000 c it forms a glass like material. This material when ground up, forms into small shards, or fibres which are once again harmful to humans.
A material that can be harmful if not properly disposed of is hazardous.
Pollution
hazardous waste
penises
overcrowding
Pollutant
pollution
vomiting
sulphide acid and hydrogen sulfate are harmful materials that can harm a metal.
Conditions that make material harmful is that when it is used for harming/destroying/killing/polluting the environment and the people.
virus is a non cellular it require to reproduce the materials of their host cell and they have those material on their structure which is harmful for the host cell.
Only if it is burning.