That graph doesn't show that emissions gone down, that shows the estimated effect on temperature growth based on targets agreed on by the Paris agreement. Neither the targets nor the temperature estimates in this graph have been met.

https://en.wikipedia.org/wiki/Greenhouse_gas_emissions

Per capita emissions growth has slowed, not reversed but the population has INCREASED. Not only is industry emitting more per person, but there are more people.

Every single type of GHG has increased as well.

We're fucked.