 On the other hand, burning these high-carbon fuels will cause the start of high climate change, non-reversible for a thousand years.He reminds us that the average earth temperature difference between the latest ice-age (c.10, 000 BC) and 1950 is around +5 °C.According to the IPCC, the temperature will rise by +3 °C or +4 °C between 1950 and 2100 since the biggest CO2-emmiting countries do not respect their commitments to the COP 21.