Not exactly "uniquely Singapore", but for a presumably developed country like Singers quite remarkable, that such is a topic for debate.
Here in The Netherlands, we recycle all our garbage: In front of our
condo here are several containers, where you can throw in, separately: textiles, organic garbage, glass, plastic, paper & carton. Furthermore on every 2nd and 4th week of the month on Tuesday morning, there is a van stopping in front, collecting all chemical disposal such as batteries and alike.
In the supermarkets you can only buy reusable bags (1 euro), all bottles of bottled drinks have a deposit of 50 eurocents and are to be returned, all garbage bags are "green" / recycable and so forth.
Why Singapore doesnot even consider such policies?