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Well, if we believe in the General Theory of Relativity, we know exactly what is causing the expansion: we live in a universe with a certain sort of geometry.
The mass/energy ratio must be slowly changing in this phase of the universe in favor of energy. To keep the speed of light constant time will be contracting.
Relying on Hubble's Law is like putting all of your eggs in one basket. Time contraction is an alternative solution to explain red-shift but it gives totally different results.