Who is the largest greenhouse gas emitter? 

A)  Japan 
B)  the United States 
C)  China 
D)  the European Union

According to data from the Global Carbon Project, China is currently the largest emitter of greenhouse gases, accounting for over 28% of global emissions in 2019. The United States is the second-largest emitter, followed by India and Russia. Japan and the European Union are also significant emitters but rank lower than China and the United States.