By signing the Kyoto Protocol, a country commits to decrease its greenhouse gas emissions. Which ecological issue does this protocol address?

A. Overpopulation

B. Water Scarcity

C. Loss of Biodiversity

D. Climate Change

The issue is the climate change. When you say Greenhouse effect it only remains in the upper layer of the atmosphere. It creates a covering around the earth that stops or hinder the heat from escaping earth's surface. Therefore this protocol addresses the climate change issue.