Used CFCs
What are CFCs and why does Shaq's Garage collect them? For many years, car air conditioners and home refrigerators used chemical compounds called chlorofluorocarbons, or CFCs for short, to help produce cool air. (New cars and refrigerators don't use them.)
CFCs become a big problem if they escape into the air. They float up into the stratospheric ozone layer—about 10 to 30 miles above the earth—which blocks the sun's most dangerous ultraviolet [UV] rays.
Once CFCs are up in the stratosphere where it's freezing cold, they destroy ozone molecules, reducing the protective ozone layer and allowing more UV rays to reach the earth, where they can cause severe sunburn, eye damage, skin cancer, kill crops and other plants, and even destroy sea life.
Fortunately, CFCs can be recycled. In the Recycle City garage, Shaq uses special equipment to capture the cooling liquids that contain CFCs from the car's air conditioner. That way, the CFCs don't escape into the air and can be used again in older cars.
(Since new car air conditioners use different chemicals that don't hurt the ozone layer, CFCs will gradually become less of a problem).