  There is a growing call for greater amounts of increasingly agile
computational power for edge and cloud infrastructure to serve the
computationally complex needs of ubiquitous computing devices. Thus, an
important challenge is addressing the holistic environmental impacts of these
next-generation computing systems. To accomplish this, a life-cycle view of
sustainability for computing advancements is necessary to reduce environmental
impacts such as greenhouse warming gas emissions from these computing choices.
Unfortunately, decadal efforts to address operational energy efficiency in
computing devices have ignored and in some cases exacerbated embodied impacts
from manufacturing these edge and cloud systems, particularly their integrated
circuits. During this time FPGA architectures have not changed dramatically
except to increase in size. Given this context, we propose REFRESH FPGAs to
build new FPGA devices and architectures from recently retired FPGA dies using
2.5D integration. To build REFRESH FPGAs requires creative architectures that
leverage existing chiplet pins with an inexpensive to-manufacture interposer
coupled with creative design automation. In this paper, we discuss how REFRESH
FPGAs can leverage industry trends for renewable energy integration into data
centers while providing an overall improvement for sustainability and
amortizing their significant embodied cost investment over a much longer
``first'' lifetime.
