Investments in biofuels are booming globally in response to increasing costs of fuels and growing concern over climate change. The high and often fluctuating fuel prices have frustrated development efforts in Ethiopia. This has prompted policymakers to review energy development strategies and...

This paper analyses the determinants of growth of American cities, understood as growth of the population or of per capita income, from 1990 to 2000. This empirical analysis uses data from all cities with more than 25,000 inhabitants in the year 2000 (1154 cities). The results show that while a...

The production of ethanol has increased in United States and Brazil in recent years, because of incentives to reduce gas consumption. In Brazil, there is a big program to use ethanol both as a single fuel or an additive to gas. In US, the incentive is to use ethanol combined to gas in proportion...

It is known that cities are the engines of growth of the modern economy and society. Herewith we highlight the national and regional characteristics of urbanization as a global process. Somewhere the urbanization is stimulated, in China for example, somewhere it is limited, as we see in Russia....

While connectivity supply is growing exponentially, likely as a result of developments in the semiconductor industry, research on connectivity has mostly focused on the demand side. Such approach is however unable to account for the introduction of unforeseen ser-vices, which is also...