Why do you think the word hemisphere accurately describes the six globes answers?

Hemisphere comes from the latin word hemi, which means half. So, hemisphere denotes a half of a sphere. Any circle drawn around the Earth divides it into two equal halves called hemispheres. 
A half of the earth, usually as divided into northern and southern halves by the equator, or into western and eastern halves by an imaginary line passing through the poles

Increasing the release of greenhouse gases and pollution