The difference between demolition and debris removal lies in the nature and purpose of the work being performed:

Demolition:          

• Demolition refers to the intentional and systematic dismantling or destruction of a structure or building.
• It involves the complete or partial removal of a structure, including its walls, roof, foundation, and other components. 
• Demolition is typically carried out when a structure is no longer usable, unsafe, or needs to be cleared to make way for new construction or redevelopment.             
• Demolition work requires specific expertise, equipment, and safety measures to ensure the controlled and safe removal of the structure.

Debris Removal:

• Debris removal, on the other hand, focuses on the clearance, removal, and disposal of debris resulting from an incident or disaster.
• It involves the collection and disposal of various materials, such as rubble, wreckage, vegetation, construction debris, and other types of waste.    
• Debris removal is aimed at restoring the affected area by eliminating immediate threats to public health and safety, facilitating recovery, and ensuring the proper management of waste.              
• Debris removal can include activities like sorting, hauling, recycling, and disposing of the debris in an efficient and environmentally responsible manner.

In summary, demolition is the intentional destruction or dismantling of a structure, while debris removal is the process of clearing and disposing of the resulting debris or waste materials. 
Both activities may be necessary in the aftermath of a disaster or as part of a construction or redevelopment project, but they serve different purposes and require different approaches.