Is there an early Universe solution to Hubble tension?
  We consider a low redshift $(z<0.7)$ cosmological dataset comprising
megamasers, cosmic chronometers, type Ia SNe and BAO, which we bin according to
their redshift. For each bin, we read the value of $H_0$ by fitting directly to
the flat $\Lambda$CDM model. Doing so, we find that $H_0$ descends with
redshift, allowing one to fit a line with a \textit{non-zero} slope of
statistical significance $2.1 \, \sigma$. Our analysis rests on the use of
cosmic chronometers to break a degeneracy in BAO data and it will be imperative
to revisit this feature as data improves. Nevertheless, our results provide the
first independent indication of the descending trend reported by the H0LiCOW
collaboration. If substantiated going forward, early Universe solutions to the
Hubble tension will struggle explaining this trend.
