Because of its importance to major areas of geophysics, AGU has reviewed the U.S. Global Change Research Program issued with the President's FY 1991 budget. Comparable reviews were conducted of the two Global Change Program documents issued for FY 1990. The FY 1991 plan if enacted will result in major advances in the understanding of Earth. Many of the concerns and suggestions expressed in our earlier reviews have been addressed including the early establishment of a global data base, building the scientific manpower capability, and the role of the Committee on Earth Sciences in international participation.