if a bunch of humans only run around in serile, anorganic rooms, houses and streets*, and the only contact to organic matter is meat and dead animals grown in other sterile, anorganic rooms, diseases can spread easily. if, however, the mass would regularly (! not only sometimes) visit organic nature, like the woods or the beaches, which they don't since they can rarely do it because of their “busy lives” (what are they all busy about...), .... ** those new diseases would also come in contact with organic nature and be part of the more stabilized microbiological world. this [teilsatz hierhinziehen] is why parks are needed for the biological health of a city, and a society of higher orders.
*“streets” appears to be, to me, a “street” way of writing “streat”, which feels like the proper british way of writing it (again laugh out loud)
** this is how you introduce a wider seperator of linguistic meaning if your german teacher doesnt like “schlangensaetze”