Why did the Earth cool down mid-1900s?

         From 1940-1775, the average global surface temperature cooled by 0.1 degrees Celsius, providing nonbelievers "irrefutable evidence" that Global Warming doesn't exist. This contradiction puzzled scientists when studying Global Warming until recently, where they finally proved that this cool-down was caused by sulfate particles(created by fossil fuel use) reflecting sunlight. The reason this cool-down ended is because countries began to make an effort reducing sulfur emissions starting in the 1970s. From there, the average global temperature has risen by roughly 0.6 degrees Celsius.

       The average surface temperature now is 1.1 degrees Celsius warmer than pre-industrial times. However, ongoing sulfur emissions still occurring now could be slowing this down. Scientists estimate that removing all aerosol emissions at once right now could easily add roughly 0.7 degrees Celsius to global temperatures. What does this mean? I believe this means that climate change is a crisis much worse than we previously thought, as this introduces the threat of larger increases to global temperature as we reduce sulfur and particle emissions.