We're all aware of the idea that Mako energy and all that is a metaphor for the way we mistreat our planet but parts of Final Fantasy VII seem to hint in an even stronger way towards the effects of climate change/global warming/take your pick. I don't know if Japan as a nation was particularly concerned with environmental sustainability in this time period but as a nation with high levels of development and yet such a fond attachment to the natural environment, I wouldn't be surprised if this was kind of a prompt to stop and take stock of what we could be losing.
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Alternatively, it's just smurfing cold at Icicle Inn for no reason.