Two videos today! This one is actually about a year old now but I've just discovered it.
'The Story Of Stuff' is a very nicely animated and clearly presented 20-minute film explaining 'the materials economy' (or consumerism, to put it another way) and how much wastefulness is embedded into modern life.
The film is more from a US-centred point of view, but resonates outside of it too. It is presented by Annie Leonard, a sustainability and environmental health expert.
A clearer version can be seen on the website.