Some geographers focus almost entirely on the how knowledge is manufactured, changed or maintained. They are probably best called:

Critical geographers

Explanation:

Critical geographers -

Critical geography depends on the reason how the substance is manufactures and altered, is referred to as critical geography.

According to which humanity has the ability to alter the environment based on their capabilities.

The study is completely based on the reason for manufacturing and alteration.

Hence, from the given information,

The correct term is critical geographers.