Updated: Jan 17, 2021
Victor Luca, 10-Jan-21.
As Earth warms, some of the most obvious signs of this warming is the melting of glaciers and sea level.
Figure 1. Arctic September sea ice extent ( 106 km2) from observations (thick red line) and 13 IPCC AR4 climate models, together with the multi-model ensemble mean (solid black line) and standard deviation (dotted black line). Models with more than one ensemble member are indicated with an asterisk. Inset shows 9-year running means. Source: Stroeve et al., Geophysical Research Letters, 2007, 34(9), L09501.
It is difficult to deny that many of the world's glaciers are in retreat.
This is the glacier Perito Moreno in Argentina.
And here is the Upsala glacier in Patagonia, Argentina.