As one of division plan of NASA Earth Science Enterprise (ESE), ESE Research Strategy is focusing on the five fundamental science questions on the Earth system as follows: (1)How is the global Earth system changing? (2)What are the primary forcings of the Earth system? (3)How does the Earth system respond to natural and human-induced changes? (4)What are the consequences of change in the Earth system for human civilization? (5)How well can we predict future changes to the Earth system? The five questions are concerned with each section of the Earth system. Under the five questions, there are 23 sub-tier questions that are discussed in more detail. [WT5HZ]