Tree size distributions have long been of interest to ecologists and foresters because they reflect fundamental demographic processes. Previous studies have assumed that size distributions are often associated with population trends or with the degree of shade tolerance. We tested these associations for 31 tree species in a 20 ha plot in a Dinghushan south subtropical forest in China. These spe...

The Islamic Republic of Pakistan celebrated its Golden Jubilee in 1997, 50 years after the partitioning of United India from the British Raj. For Pakistan (fig 1), this was also a time to evaluate the health and population status of its people. In Pakistan, during the 1940s, population growth rates begin to accelerate as health improvements lengthened life expectancy and birth rates remained hi...

This paper relates national fertility rates to political factors. I first review evidence that community norms affect fertility, ethnic groups compete politically in many countries, and a group’s relative size affects its ability to compete. This evidence jointly suggests that population growth and fertility may be public goods at the ethnic group level in diverse societies. Next, I present a s...

This paper provides a personal perspective on the rich discussions at the Bixby Forum. The size, rate of growth and age structure of the human population interact with many other key factors, from environmental change to governance. While the details of future interactions are sometimes difficult to predict, taken together they pose sombre threats to a socially and economically sustainable futu...

In the light of previous literature fertility determines different economic, social and program inputs variables. The main object of this study to investigate the impact of sector specific (health and education) foreign aid on fertility in case of Pakistan. For empirical investigation Auto Regressive Distributed Lag Model (ARDL) is used over the period of 1973-2012. The results of the study sho...

Investments in education, particularly in girls’ education, can play an important role in promoting demographic changes conducive to slower population growth. Increased education raises the mean length of generation, that is, the amount of time a cohort of women takes to reproduce itself. Increased education is also associated with better utilization of public health and family planning service...

The world’s population was 6 billion at the turn of the twenty-first century. It is projected to reach 9.4 billion in 2050 and will stabilize at slightly less than 11 billion about 2200. Global rates of population growth peaked at 2.04% per annum in the late 1960s but subsequently declined to 1.33% in the late 1990s and are projected to continue to decline. The cause of the decline has been a r...

in this study an attempt has been made to empirically examine the relationship between biodiversity and economic growth using indicators of species diversity and income per capita as proxies for biodiversity and economic growth, respectively.also the effects of agricultural value added as a percentage of gdp, trade freedom index, exchange rate, population, percantage of land developed for agric...