What phenomenon has the IPCC marked with 'very high confidence' regarding climate change?

The assertion that the Arctic region will warm faster than the rest of the planet is supported by extensive scientific research and observational data. The phenomenon known as Arctic amplification explains this trend, where the Arctic warms at a rate that is significantly higher than the global average due to a combination of feedback mechanisms, such as the melting of sea ice and changes in surface albedo. As ice melts, it exposes darker ocean water, which absorbs more sunlight and increases warming. This accelerated warming in the Arctic has widespread implications for global climate patterns, ecosystems, and sea levels.

In comparison, the other options do not align with the scientific consensus reported by the IPCC. For instance, rather than becoming less acidic, oceans are experiencing increasing acidity due to higher levels of carbon dioxide, which is absorbed by seawater. The prediction that global temperatures will stabilize by 2100 is not supported by current models, which indicate an ongoing increase if emissions are not significantly reduced. Lastly, the claim that polar ice caps will increase in size contradicts observed trends showing that both Arctic and Antarctic ice masses have been declining in volume and extent.