Considering the earth is anywhere from 3.5-4.5 billion years old, the Universe 13.5 billion years old, and humans have been here for only a brief moment of that time, who's to say this weather pattern has not already repeated itself thousands or tens of thousands of times ? Human view of time is so limited, and what happens in a 50-100 year period may seem significant or eventful to us, but viewed in perspective, events like glacial melt are not only normal but irrelevant.
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DD: Is it just coincidence that groups like JWs say we are near the END?? What if they are accidentally right this time?
A broken clock is also correct twice a day...so what??
Incidentally, the scr. in Revelation WT uses to "prove" humans will "ruin the earth" is a complete misapplication. "Ruining the earth" alludes to spiritual/moral ruin, not a destruction of the planet.