Strayer, Chapter 24 (pp. 747-755)

There are three main factors that led to the global expansion in the world. The first factor would be the increase of human numbers, never this many people in the world before. The second factor would be oil or "fossil fuel". The third factor would be the large amount of environmental transformation. In the 20th Century Environmentalism during the time of romanic poets. Globalization of environmentalism also made known conflicts between the North and South.