Yeah, we sure wouldn't mind yearly inoculations for cancer.
Environment: A chemical you add to the factory smokestack by products to eliminate the harmful toxic chemical. You can do it at level in the smokestack. A vaccine if you will for all the different kinds of chemical created smoke entering the atmosphere; turn it back to pure air.
Also, a chemical you spray on trees from a plane to keep them from burning. (And of course doesn't hurt anyone or anything in the process.)
Christ! Why can't we come up with a pill to correct blurred vision.
Why haven't we come with a disposable, biodegradable transport vehicle exhaust system add on?
Right, mental health check: Work on yourself; little more then just being aware of being in your own skin, somewhere, for as long as you can.