Year 0 in your chart is 1969, so omits all of the warming that we have had since then.
You should have a read of the IPCC 1.5ºC Special Report (SR15) that was released today:
Human activities are estimated to have caused approximately 1.0°C of global warming above pre-industrial levels, with a likely range of 0.8°C to 1.2°C. Global warming is likely to reach 1.5°C between 2030 and 2052 if it continues to increase at the current rate. (high confidence)
http://report.ipcc.ch/sr15/pdf/sr15_spm_final.pdf