Though the population in developed countries represents a small amount of the world population, they consume fossil fuels much faster than developing countries. For example in the United States, each person contributes about 1,644 tons of carbon dioxide. That is five times higher than a person in China.
Though levels of consumption differ greatly around the world based on economic status, the higher the population, the higher our total levels of consumption. Some solutions to avoid this are: To lower levels of unnecessary consumption in developed countries, and find sustainable solutions to meet increasing demands on food, water, fuel, and other basic resources. To provide universal access to family planning, services, contraceptives, and information. And to empower women, this means to give women access to health care, education and birth control.
Imagine this glasses represent the differents countries, the fuller the glass gets, the more people there will be. This image represents the entire world.
A thousand years ago the american's glasses were empty, Europe and Africa have less than 100 million people between them. And just like today, most people live in China, India and the rest of Asia.
For centuries things stay pretty much the same, births were cancelled out by deaths, women are having lots of babies, but most of them die before they grow up and have their own families. We don't reach one billion until 1804, but things are changing, now better medicine and better agriculture can reduce the amount of deaths, of course people are still diying, but more babies grow up and have babies of their own.
We have grown from one billion to seven billion and it only took 200 years. Some people say we will level out to ten billion by the end of the century, but the question is: Can the world hold many people?, well experts don't agree, because it all depends on how well we manage our food, water and energy.
An environment is a system of living things, the earth is our environment. The capacity of our environment to provide space to produce food into supply energy are all limited. Humans thrive on less than 17% of the earth's surface and only about 4% in growing crops. We depend on limited resources for our survival. Yet we are increasing our population as if they were infinite this fact is the core of our problems.
This map shows population growth, population concentrations is indicated by dots, each of them represent 1 million people.
The earth's size remains the same. Slowing human population growth and lowering our use of natural resources are key to reducing the impact we have on the planet, though the decisions we make about our lifestyles, our numbers and our consumption.
In the population pyramid, the data is divided by gender, with females on one side and males on the other. The population numbers are shown for each five year age interval, starting from 0-4 and continuing up to 100 and up. These intervals are grouped togother into pre-reproductive, reproductive and post-reproductive years.
Such population pyramid can be a powerful predictor of future population trends. For example...
Rwanda's population pyramid shows it to be a fast-growing county, with most of the population being in the youngest age groups at the bottom of the pyramid. The number will grow rapidly in the coming years. As today's children reach they reproductive years and have children of their own, the total population is almost certain to double within the next few decades.
Countries that have only recently begun the process of industrialization typically see an increase in life expectancy and a fall in child mortality rates as a result of improvements in medicine, sanatation, and food suply.
While birth rates remain constant, leading to a population boom. Developing countries that are farther along in the industrialization process begin to see a fall in birth rates, due to factor such as increased education and opportunities for women outside of child-rearing and a move from rural to urban living that makes having large families and less economically advantageous. Finally, countries in advanced stages of industrialization reach a point where both birth and death rates are low, and the population remains stable or even begins to decline.
Links to the videos: LINK
No hay comentarios:
Publicar un comentario