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This publication analyzes changes of global warming rates (GWR) expressed in Centigrade per year (°C/y) and introduces a parameter “global warming acceleration” (GWA) expressed in Centigrade per year per year (°C/y2). GWA may be applied for prediction of the GWR for the next decade. If the current decrease of GWA will continue for the next 11 years, Global Warming Rate will increase from the current +0.017 °C/y to +0.019 °C/y, for land+ocean.