TFS, scientists have been looking for alternative explanations for 30 years and found nothing that matches the new observations.
Darron, CMB polarisation has only recently been discovered, so I don't see that it makes much sense to say that scientists have been looking for alternative explanations for it for thirty years.
What cosmologists
have been looking for for thirty years is
evidence for inflation - which they now think they've found. No-one, to my knowledge, has seriously suggested any alternative to the current Big Bang + Inflation model, despite its glaring inconsistencies - not the least of them being the necessity for the universe to have expanded at greater than the velocity of light,
post-inflation.
TFS