birthrate，birthrate英语阅读答案

birthrate

1. Global Population Trends

a. Too many people on earth and a few rapid increase in the number added each year.

Global population is increasing at a rapid pace, leading to concerns about overpopulation.

2. Historical Perspective

a. A long period when death rates exceed birthrates and then a short period with higher fertility and lower mortality.

Throughout history, there have been times when death rates were higher than birthrates, leading to population decline.

3. Current Challenges

a. Despite the highly publicized “longevity revolution,” life expectancy among the elderly in the US is hardly improving.

While there have been advancements in healthcare, birthrates are falling, leading to an aging population in many countries.

4. Population Extinction Risk

a. Often, societies were in clear danger of extinction because death rates could exceed their birthrates.

In the past, societies faced the risk of extinction due to imbalances between death and birth rates.

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