Population aging is one of the major inevitable consequences of demographic transition. This chapter examines the trends and patterns of population aging in major regions of the world from 1950 to 2050. The decline in fertility since the 1970s in most regions (except sub-Saharan Africa) led to...
2]. A transformation of the major health threats has been occurring due to population ageing. In the early twentieth century, the major health threats were communicable diseases, infectious and parasitic diseases, which most often claimed
When will the world reach its peak population? According to data from the United Nations’ 2022 Revision of its World Population Prospects, we could see a peak of over 10.4 billion people sometime in the late 2080s. While the UN’s projections are the most widely used, this doesn’t ne...
. Rapidly aging Japan is unusual among developed countries. The aged population in Japan accounted for only 7.1% of the entire population in 1970 but in 1994, a mere 24 years later, it had doubled in scale to 14.1%, which indicated an unparalleled pace compared with other countries; for ...
The growing number of ever--- smaller families is still going on, but Mr Gibson pointed out that family growth was not the same as population increase in the 1970’s. The same age factors that are increasing the number of families also happened then, but in the 1970’s the proportion(比...
Ecology: Global amphibian population declines The decline and disappearance of relatively undisturbed populations of amphibians in several high-altitude regions since the 1970s suggests that they may h... RA Alford,PM Dixon,JHK Pechmann - 《Nature》 被引量: 1369发表: 2001年 Global amphibian ...
根据第一段“As the world's population continues to increase, so does the amount of global waste. According to data (数据) collected by the World Bank Group, nations are on pace to produce 4 billion tons of waste every year by 2100. Many experts are calling the problem of global waste ...
The ecological challenges to population growth Humanity has succeeded in expanding the carrying capacity of the whole planet for its own species by systematically overcoming natural constraints. The exp... UE Loening - 《Transactions of the Royal Society of Tropical Medicine & Hygiene》 被引量: 4发...
revitalization strategy that aims to achieve basic modernization of agriculture and rural areas by 2035 has somewhat surpassed the expectations of many countries. The domestic production of agricultural produce in China can fulfill the growing food demands of China's more than 1.4 billion population. ...
Using satellite imagery, drone imagery, and ground counts, we have assembled the first comprehensive global population assessment of Chinstrap penguins (Pygoscelis antarctica) at 3.42 (95th-percentile CI: [2.98, 4.00]) million breeding pairs across 375 e