No, rubber and plastic do not decompose the same way, not even all plastics decompose the same. As stated, an automobile tire will decompose entirely in 50-80 years. A plastic bottle will take ~450 yrs to decompose. Styrofoam doesn't decompose at all. So it is Styrofoam and like materials that produce the "everlasting" micro-plastics, not all plastics. That is not to say you can't have micro-particles of rubber or plastics in the food chain, especially if we are producing the materials at a faster rate than they decompose.One thing to keep in mind is that the rubber will decompose over time. A car tire will completely decompose in 50-80 yrs.
But this doesn't mean that there should still be 50-80 yrs worth of accumulation of worn tire rubber left around. That 50-80 yr figure is for a tire that is still one large single lump of rubber not already broken up into innumerable small particles.
An analogy is like dropping a salt lick block whole into a lake and grinding it to a powder first and scattering it over the whole lake. The block will take a lot longer to dissolve than the powder will.
Stupid question but micro plastics hang around and never completely disappear. They apparently wind up back in the food chain. Does rubber and plastic not decompose in a similar way, do we have micro rubbers:) in the food chain as well as plastics.
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