On most plastic jars, containers and other packaging of products you buy, you'll find what's generally accepted as the recycling logo with a number in the middle and letters underneath stamped into the plastic.

The recycling logo can be a little misleading - just about anything can be recycled, but sometimes not without major effort. It's a little bit like extracting oil from under the ocean bed compared to extracting oil from tar sands; none of it's really good as such, but some plastics are far, far worse than others.

The Society of the Plastics Industry (SPI) implemented the system in 1988 to allow recyclers to be able to tell the different types of plastics when sorting. Basically, the numbers in the triangle indicate the grade of plastic - the resin ID code. It's now a system that's used in many different countries.

Here's what to look for and what it all means:

1 - PETE - Polyethylene Terephthalate

The easiest of plastics to recycle. Often used for soda bottles, water bottles and many common food packages. Is recycled into bottles and polyester fibers

2 - HDPE - High density Polyethylene

Also readily recyclable - Mostly used for packaging detergents, bleach, milk containers, hair care products and motor oil. Is recycled into more bottles or bags.

3 - PVC - Polyvinyl Chloride

This stuff is everywhere - pipes, toys, furniture, packaging - you name it. Difficult to recycle and PVC is a major environmental and health threat.

4 - LDPE Low-density Polyethylene

Used for many different kinds of wrapping, grocery bags and sandwich bags and can be recycled into more of the same.

5 - PP - Polypropylene

Clothing, bottles, tubs. Can be recycled into fibers.

6 - PS - Polystyrene

Cups, foam food trays, packing peanuts. Polysterene is a real problem as it's bulky yet very lightweight and isn't really worth recycling.

7 - Other

Could be a mixture of any and all of the above. Or plastics not readily recyclable such as polyurethane. Avoid it if you can - recyclers generally speaking don't want it.

G - GLT - Green Living Tips

The Green Living Tips logo of course! - sorry, couldn't resist :)

So there you have it - the recycling logo when stamped into plastic isn't a guarantee that what it's stamped into is easily recyclable and in some cases it's not at all. Look for products where the packaging is stamped 1 or 2 where you can.