Clean Diesel
A turbo diesel with clean injecors, an injection pump that's set on the slow side and a particle filter should be less poluting then a compairable petrol vehicle. Depending on the traffic, it might even be cleaner then a comperable hybrid vehicle (e.g. if your driving long distances at the same speed, a modern, clean direct injected turbo diesel will be 'cleaner' then a toyota prius).
It comes down to providing more air for the same amount of fuel.
The next thing you could do is add lpg injection. This results in higher efficiency, meaning more of the fuel is burned so less particels remain.
Bio Diesel is not free from debate. Not so much from an environmental point of view, but because of the socio-economic impact in the third world... .
Better still is driving it less miles, or (and?) getting something more economical. Land Cruisers aren't exactly frugile, isn't it.
What I'm trying to do right now is to organize my daily life in a way that I'm not depending on fosil fuels for my daily transport, so compensating for the fosil fuels I use doing the things that make me happy (traveling).
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