Both of them are actually pretty serious. The melting of the permafrost is actually releasing more toxins into the air. Carbon and methane that have been locked away for millions of years are now leaking back out into the atmosphere and making the situation worse. The melting in the arctic has drastically risen the amount of polar bears that are drowning, unable to find stable ice. The emperor penguin is at risk for extinction by the end of the century if the melting pattern continues, and both poles are experiencing severe ice shelf breakaway, along with a breakdown of existing infrastructure due to extreme melting.
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