1990s Global Change Action Plan. 1990. In recognition of the critical importance of ecological research in understanding, predicting and ameliorating global change, a group of scientists representing 25 research sites met in November 1989 to consider how a network of ecological sites might contribute to research on global change. Network Office Publication Number 4. 1990s Global Change Action Plan: Utilizing a Network of Ecological Research Sites. November 1989, Colorado.