What were Thomas Malthus' ideas on population growth?

In 1798, English clergyman Thomas Malthus wrote "An Essay on the Principle of Population," in which he described the problems of population growth. Malthus argued that the world's population grows faster than the food supply, but there are such checks as war, famine, disease, and disaster that limit the population.

How widespread was the influenza pandemic of 1918?

In 1918, a deadly flu spread quickly around the world. Within just two years, this influenza pandemic had sickened over a billion people and killed more than 21 million. Half a million people died in the United States alone.

How does medical geography help control the spread of diseases?

Medical geographers and epidemiologists (scientists who study diseases and epidemics) use mapping to monitor the spread of diseases and locate the source of a dis-

What is a refugee?

A refugee is a person who leaves his or her home country for fear of persecution. There are approximately 15 to 20 million refugees in the world today. Most refugees come from developing countries where society is in flux or even chaotic. Refugees usually flee to the closest stable country, so different countries see great variation in the number of refugees based on the political climate of their neighbors. Thus, developed countries consistently have a large number of refugees arriving. Refugees are problematic, just as any mass immigration is.

ease. For example, by mapping a group of inordinately high numbers of cancer patients in a city, we may find that all live close to a factory that has been releasing toxins into the ground water. By identifying the source and spread of a disease, the disease can often be combated.

What revolution attempted to stop world hunger?

Begun in the 1960s, the "Green Revolution" was an attempt by developed countries and such international organizations as the United Nations to transfer agricultural technology to less-developed countries. While the Green Revolution increased agricultural yields, it modified the ecology of traditional agricultural systems (such as through the use of chemical fertilizers) and has yet to cure world hunger.

What is a UNESCO World Heritage Site?

The United Nations Educational, Scientific and Cultural Organization's stated purpose is to build peace in the minds of mankind. It is one of the most important agencies within the U.N. A World Heritage Site represents our natural or cultural wealth, the most important landmarks in the world that should be shared with everyone. Because of the special significance of these places, they must be protected for us to see, so that we may pass on knowledge of our shared culture to future generations. They can be both physical places built by man, or natural wonders.

How many refugees are there?

There are approximately 8.3 million people who are classified as refugees, living somewhere outside of their home countries, because of deplorable conditions at home, warfare, or government and societal discrimination and economic oppression.

How many people are abducted and sold into slavery each year?

About 600,000 to 800,000 people, mostly women and children, are trafficked across national borders each year and forced to work as virtual slaves. Millions more are trafficked within their own countries every year. Seventy-five percent of these people are women who are used for sexual exploitation. About 280,000 of these people are sent to Asia, and another 210,000 people are trafficked to Europe and Russia.

Many countries participate in human trafficking, both as accomplices in providing the people to abduct by not enforcing laws, or by allowing the people to enter their borders. Some of the biggest offenders include Saudi Arabia, Bahrain, Kuwait, Malaysia, Qatar, United Arab Emirates, Ukraine, Russia, Moldova, Mexico, India, Egypt, and China.

In the past, how many people were sold into slavery in the United States?

Until the nineteenth century and the end of the Civil War, the United States had a long history of slavery. During the African Diaspora, beginning in 1619, approximately 12 to 13 million Africans were taken from their homes and sold into slavery in the Americas and the Caribbean. The majority of the slaves who survived the voyage were sent to Brazil. By the beginning of the American Civil War, nearly 240 years after the first slaves arrived in the American colonies, four million people were held as slaves, principally in the South, where slave ownership was legal and was a main source of labor for agriculture.

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