Why Has East Asia Come to Occupy a Central Position

Why has East Asia come to occupy a central position in climate change debates?

A) because the Kyoto Protocol originated in this region
B) because South Korea leads the world in climate change research
C) because it will be the hardest hit region as climate change continues
D) because of Japan's leading role in the solar energy industry
E) because China has surpassed the United States in greenhouse gas emissions and now has the highest emissions in the world