Final answer:
Mackenzie points out that local knowledge such as advanced agricultural techniques, ecological awareness, and medical uses of herbs were silenced. This knowledge was rooted in indigenous and traditional practices, yet often disregarded by European colonizers and academic traditions.
Step-by-step explanation:
According to Mackenzie, the specific kinds of local knowledge that were silenced include advanced agricultural techniques, ecological awareness, and medical knowledge such as the use of native herbs for health purposes. An example of this is the use of the peacock flower by Native American and enslaved African women to induce abortions, a practice dismissed by Europeans. This dismissal resulted in a loss of beneficial knowledge for the colonizers. The silencing of local knowledge also extends to Indigenous philosophy and oral traditions, such as those incorporating ecological and historical experiences, which academic philosophy has traditionally neglected. Additionally, traditional ecological knowledge has been passed down through generations and can be critically instructive to conservation. However, this knowledge has often been ignored or undervalued in favor of Western scientific practices.