  Global warming is affecting our Earth's environment. For example, sea level
is rising with thermal expansion of water and fresh water input from the
melting of continental ice sheets due to human-induced global warming. However,
observing and modeling Earth's surface change has larger uncertainties in the
changing rate and the scale and distribution of impacts due to the lack of
direct measurements. Nowadays, the Earth observation from space provides a
unique opportunity to monitor surface mass transfer and deformations related to
climate change, particularly the global positioning system (GPS) and the
Gravity Recovery and Climate Experiment (GRACE) with capability of estimating
global land and ocean water mass. In this paper, the Earth's surface fluid
variations and deformations are derived and analyzed from global GPS and GRACE
measurements. The fluids loading deformation and its interaction with Earth
system, e.g., Earth Rotation, are further presented and discussed.
