The problem = the solution. The main thesis of this article is that there are large numbers of people not doing useful work and a large amount of useful work that obviously needs to be done. Let's put the two together. Look at how many people are available for useful and needed work!
Unemployed, official and unofficial.
Unemployed because of mental or physical handicaps.
Employed but doing useless work.
Employed but doing harmful things to the earth and/or