The idea of recycling materials is a good idea but there are concerns to some recycled ideas. Specifically the recycled tires used in playgrounds. There are toxic substances that are in tire dust are also in tire mulch. There is some concern that people ingest these substances through their skin and when they breathe. This can cause health problems.
Heritability is defined as the proportion of variance in a trait which is attributable to genetic variation within a defined population in a specific environment.