Hopes that Rio would commit the world to move towards a green economy were diluted by suspicions among some developing nations that this was another way for wealthy nations to impose a "one-model-fits-all" approach.
But VW's woes are deeper than a one-model blip.
Downey uses an HTC One model and, like a lot of industry analysts, believes in their quality, the company says.
The adopted methodology is based on two models: a one-dimensional model and a CFD model.
Beras said that when his models were invited on to a TV show, the host laughed while holding a cake under one model's nose.
This reduced the n-dimension model to a one dimensional model.
Taking a different approach, Yoobi is a school supply company that is built on a "buy one, give one" model.
Mr. Maxton said Chinese carmakers sometimes copied the exterior of a car from one model, and the interior from another.
Our results do not indicate a preference for one model over the other.
It takes four years to produce a market-ready vehicle, and a typical lifecycle for one model is seven years.
From a marketing standpoint, Toms Shoes "Buy One, Give One" model is a winner.
