The primary objective of the 'Kyoto Protocol' is the regulation and reduction of:

The correct option is Emissions of greenhouse gases.

Explanation:
The Kyoto Protocol is an international treaty adopted in 1997 in Kyoto, Japan, under the United Nations Framework Convention on Climate Change (UNFCCC). Its main target and primary objective is to combat global warming by committing industrialized countries and economies in transition to limit and reduce greenhouse gas (GHG) emissions in accordance with agreed individual targets.

Breakdown of Options:
• Stratospheric ozone depletion: Addressed primarily by the Montreal Protocol (1987).
• Transboundary movement of hazardous wastes: Regulated by the Basel Convention (1989).
• Emissions of greenhouse gases: Regulated by the Kyoto Protocol (1997).
• Biological diversity loss: Covered by the Convention on Biological Diversity (CBD) (1992).