Just about every plant, insect, and animal alive today that lives above ground can survive a wide range of temperatures. There's an 80 degree delta between winter and summer and a 30 degree swing between morning and night. One degree average increase is not detectable without statistical analysis of millions of readings or by using a natural computer such as a geographic area on Earth that averages around the freezing point. It's very hard to see evidence of warming changes outside that very narrow latitude.
Now that we've removed the soot from the air I wonder if sea salt might be a good replacement for recreating the lost clouds. By spraying seawater into the air, maybe using free wave energy, we get low level salt nucleotides and water vapor that might be useful for manufacturing man-made low clouds. These would reflect sunlight during the day but burn off and allow surface radiation at night. We could probably cost effectively manage the local climates in the oceans to be whatever temperature we want.
To get the right kind of clouds in the right place, you really need to get the particulates into the stratosphere. With a high soot level, normal circulation EVENTUALLY does that. But, if you want to do it in a hurry, it seems to me that the easiest way is to use a jet fuel formulated to have a high sulfur content. You might want to have tanks of low sulfur fuel for takeoffs and landings. Burning the high-sulfur fuel at cruise altitudes will deposit sulfur oxides directly in the stratosphere, where, being highly hygroscopic, they will rapidly accumulate any surround water vapor and form coulds, thus changing the earth's albedo (and cooling it).