: Much human behavior is directed and sustained over long periods, even though the external inducements for it may be few and far between. Under conditions in which external imperatives are minimal and discontinuous, people must partly serve as agents of their own motivation and action. In social

, with the economies of China and India expanding with double digit growth rates, Asia can become a much larger source of ABCs, depending on the energy path taken to sustain this growth rate. In fact new estimates indicate that BC emissions for China in 2006 have doubled since 2000, whereas SO2 emissions have grown

Sustained periodic terrestrial locomotion in air-breathing

Availability of soil water is the single most important factor modifying sustained productivity and persistence of cool-season grasses. Water deficits resulting from intermittent or prolonged periods of drought can lead to significant reductions in leaf area, which is critical in determining dry

of the infrastructure over a 24-hour day, by avoiding long queues during prime daytime hours and inactive periods during the wee hours of the night. A proper pricing structure known in advance to the captains of the barges will shape their decisions to enter the locks at a moment that is economically most appropriate

over sustained periods of time. The leaders attended both to assuring continuity and stability at the same time as they supported the evolution and transformation of their communities. The themes that these successful leaders focused on were: being together inside their communities, maintaining

period since 1973. The results differ from the conventional wisdom along a number of dimensions. First, it is shown that under reasonable assumptions the timing, magnitude and even the sign of exogenous oil supply shocks may differ greatly from current state-of-the-art estimates. Second, the common view

to sustained differences in economic outcomes. Areas in which proprietary rights in land were historically given to landlords have lower agricultural investments and lower productivity in the post-Independence period than areas in which these rights were given to the cultivators. The results are robust even

and public revenues, allowing for structural breaks, are performed for the EU countries for the 1970-2003 period. The “unpleasant ” empirical results show that with few exceptions fiscal policy may not have been sustainable. EU governments therefore could risk becoming inherently highly indebted, even

biological sustainability studies