Which of the following processes can reduce hazardous waste generation at its source?

Process modification is indeed the approach that can effectively reduce hazardous waste generation at its source. This strategy involves analyzing and altering existing production processes to minimize waste creation. By implementing changes such as switching to less hazardous materials, improving operational efficiencies, or adopting more sustainable practices, businesses can significantly lower the volume of hazardous waste they generate. This proactive approach not only helps in compliance with regulations but also promotes environmental sustainability and can result in cost savings for organizations in the long run.

In contrast, increased outsourcing, incineration, and landfilling do not address the root causes of hazardous waste generation. Increased outsourcing may simply transfer the waste generation problem to another facility or country without reducing the volume produced. Incineration and landfilling are methods of waste disposal rather than reduction; they manage the waste after it has been produced rather than preventing it from being created in the first place.