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The increased melting in Antarctica and Greenland has surprised / shocked everyone. We now know of several mechanisms that are melting the ice much more quickly that we thought possible. The main one is warm water under the projecting ice floating the ice (because of the rising sea level) and this is a strong feedback.
Dark snow is another unexpected factor - lower albedo of darker snow is caused both by ash from wildfires and volcanoes and pollution, and by cyanobacteria, and simply by accumulation of these, as the surface melts.
Another factor is changes in the jet stream and / or ocean currents due to the increased melt. The jet stream is weakening, and getting quite wobbly, and the salinity of the surface water is dropping due to the melt water.
Because of science, you don't have to take my word for it.
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