Automobile exhaust emission are an important feature of urban environment contamination due to movement of high traffic density and are widely believed to have detrimental effects on plant growth. The effects of automobile exhaust emission on the germination and early seedling growth performance...

Transport is an integral component of the energy system, and in Sub-Saharan Africa the demand for transport has been increasing due in part to population growth and economic development. To demonstrate the extent of this increased demand, emissions from transport in Africa grew by 84% over 6...

This paper investigates whether it is possible to entertain simultaneously two attractive views about US GDP. The first is that long term growth in US GDP is attributable to an empirically plausible specification of random technical progress. The second is that deviations of GDP from a fitted...