The transport sector is among those most responsible for the greenhouse effect, because of the absolute growth of vehicles and miles driven, which more than offset a slight gain in engine efficiency ( in technical terms is called rebound effect). Until very recently, most builders did not care Many of these issues, and together with the concept of "security", was the growing power of the cars to characterize the commercial. An example is the spread, even in the towns, the Vagon Sport Utility (SUV), which certainly offer different sensations at the helm, but from the perspective of ecological (and economic) are real disasters.
natural that in recent years, compared with a constant increase in fuel prices, this process has experienced a significant slowdown. Indeed, some, like General Motors, which had bet heavily on this segment has literally thrown against the wall and now we are paying the consequences of care, with plant closures, massive layoffs and the loss of U.S. leadership in the automotive sector, which in part also depend on the fact that she was puzzled. Other giants, like Ford, do not fare much better. For the benefit of Toyota, which invests instead for a decade now, along with Honda, clean and efficient technologies, like hybrid engines, or the combination of an electric motor to a combustion engine, which also reduces fuel consumption by up to 30 %.
But boiling pot are many things done tare hydrogen car, which will require several years of development and particularly the resolution of the long question of how to make hydrogen (which is not a source of energy but a vector), are entering market alternatives. They range from the use of methane for the production of biofuels with different levels of purity (biodiesl in various blends, ethanol), the combination of different technologies, such as biodiesel with hybrid engines. In this article Il Sole 24 Ore broad overview.
In short, then the options available to those who, in addition to aesthetic and functional aspects, in a car looking for efficiency and environmental friendliness, will grow by much. A shadow in all this? The options are many and not all compatible with each other (eg a car can not go to bioethanol biodiesel), it seems to have emerged yet a standard and this could fragment the market, slow down the spread of solutions and take them into high costs. There remains the problem that we can not devote a large part of vegetable crops to produce fuels (for obvious reasons of survival and equity), but reducing the movement or use alternative means and increasingly effiicient.
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