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The standard cosmological paradigm narrates a reassuring story of a universecurrently dominated by an enigmatic dark energy component. Disquietingly, itsuniversal explaining power has recently been challenged by, above all, the$\sim4\sigma$ tension in the values of the Hubble constant. Another, lessstudied anomaly is the repeated observation of integrated Sachs-Wolfe imprints$\sim5\times$ stronger than expected in the $\Lambda$CDM model from R>100$Mpc/h$ super-structures. Here we show that the inhomogeneous AvERA model ofemerging curvature is capable of telling a plausible albeit radically differentstory that explains both observational anomalies without dark energy. Wedemonstrate that while stacked imprints of R>100 $Mpc/h$ supervoids in cosmicmicrowave background temperature maps can discriminate between the AvERA and$\Lambda$CDM models, their characteristic differences may remain hidden usingalternative void definitions and stacking methodologies. Testing the extremes,we then also show that the CMB Cold Spot can plausibly be explained in theAvERA model as an ISW imprint. The coldest spot in the AvERA map is alignedwith multiple low-$z$ supervoids with R>100 $Mpc/h$ and central underdensity$\delta_{0}\approx-0.3$, resembling the observed large-scale galaxy densityfield in the Cold Spot area. We hence conclude that the anomalous imprint ofsupervoids may well be the canary in the coal mine, and existing observationalevidence for dark energy should be re-interpreted to further test alternativemodels.

A common explanation of the Hubble tension and anomalous cold spots in the CMB