Ecofriendly, biodegradeable, contemporary buzzwords yada yada. Heard it all before.
Next thing you know those making bucks from this crap will be claiming SP's are helping to combat GW and GH gas emissions... but they'll have to commission the right "scientist"

to report only his findings that 'conveniently' fit the employing manufacturer's agenda.
Importers/retailers don't give a sh!t what you do with their product once they've got your buck. They LIKE you to lose them and buy more.
Take a look at a few dead seabird skeletons in areas of high SP use... check the gut area and identify the remnants of their feed.... may be a bit of an eye opener!!
If a seagull's gut juices can't digest this crap then, apart from hopeful anglers, just how many other creatures are being killed by these things?
I reckon too many people too quickly believe too much of what they read and then simply repeat what they've read.
I simply wouldn't believe everything I read.
In my experience, statistics are mostly used by those quoting them only when it is in their favour or 'convenient' to do so. And we all know how statistics can be used to support any argument.
Remember PCBs Dioxin 1080...? Add SPs to the list.