Re: raised garden bed
While it is true that the formulation of preservatives is not the superfund concoction that it used to be, it still isn't anything I'd want my food near. You are better off to use rot resistant wood species or masonry. What you want to look for are woods with a high tanic acid content, such as redwood, cedar, spruce, and others. You can use Trex and Trex-like products, though those products are made with recycled plastics, plastics which do leach into the soil.
Masonry is also a good choice, but you must be aware of it's origins as well. In the states that use a lot of coal for power generation, the fly ash residue is used in the making of cement products. Fly ash is high in mercury and other toxic compounds which are not safe or fit for consumption.
Bottom line, if you're looking for a healthy and green way to build raised beds, you want to use natural products. If you use synthetic products, be aware of what is in them and what would be imparted into your food chain.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!