For over two years the Mercedes-Benz Econic NGT (Natural Gas Technology) has been playing its part in mitigating the extreme smog that plagues the Greek capital of Athens. In Stockholm, the Econic is powered by biogas produced in Sweden from waste water and a proportion of household refuse, meaning that not only is the vehicle an environmentally-friendly way to empty refuse bins, but it is also actively reducing the waste mountain too. Now Mexico City too wants to try out a similar concept in order to address its pressing environmental problems.