In my opinion, whether to hibernate or not is down to personal choice.
As previously stated in this thread, Tortoises hibernate as a means of survival in order to escape extreme cold, therefore if temperatures are maintained throughout the year then there is no necessity for them to hibernate. These animals, like many others, have adapted over many thousands of years to survive the prevailing conditions and, should the doom-mongers be correct in their assumptions that the planet will heat up, then I'm certain that they will again adapt and no longer hibernate in the wild, with no ill effects.
The decision you need to make is whether to provide artificial conditions, i.e. heating and lighting, so that hibernation is not required or provide artificially cold conditions, during our milder winters, in the form of fridge hibernation, neither of these options being natural in the wild. However, should the temperatures rise in their countries of origin, I somehow doubt that the local Tortoise population will be ordering fridges from their equivalent of Currys, because they think that it would be unnatural for them to stay active all year round. They are more likely to adapt to whatever nature throws at them
My advice is research as much as possible before next winter then decide for yourself whether to hibernate your animals or not and don't feel any guilt if you decide to keep them awake.
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