Effects of a different CMBR temperature?

[vicky_molokh]

Originally Posted by Wavefunction

If it's a small different then there likely wouldn't be much of a change. The universe has been consistently expanding for billions of years, this expansion leads to the gradual reduction of the CMB temperature. This is because the energy density of radiation is inversely proportional to the scale of the universe raised to the fourth power, thanks to the effects of volume and wavelength - increasing wavelength decreases frequency, whic decreases the energy of radiation.

[ . . . ]

In short, a higher CMB temperature wouldn't produce much of an effect, unless you're talking about a rather more extreme increase than I think. In which case, I'd need some time to think it over.

What do you count as a little, and what is (the beginning of) extreme, and what would be the sensor modifier effects of the former and the latter?