16.1 Human Population Growth And NaturalResources Warm-Up 16.1 • Write 3 open-ended questions & 2 closed ended.
16.1 Human Population Growth And NaturalResources KEY CONCEPT As the human population grows, the demand for Earth’s resources increases.
16.1 Human Population Growth And NaturalResources Earth’s human population continues to grow. • Earth’s human carrying capacity is unknown. • Population is now around 7 billion!!! Jesus! Population Clock http://www.worldomet ers.info/world- population/
16.1 Human Population Growth And NaturalResourcesHow is the population distributed around the world?
16.1 Human Population Growth And NaturalResources • Technology has helped to increase Earth’s carrying capacity. – gas-powered farm equipment – medical advancements
16.1 Human Population Growth And NaturalResources The growing human population exerts pressure on Earth’s natural resources. • Nonrenewable resources are used faster than they form. – coal – oil
16.1 Human Population Growth And NaturalResources • Renewable resources cannot be used up or can replenish themselves over time. – wind – water – sunlight • Growing use of nonrenewable resources may lead to a crisis. • Resources must be properly managed.
16.1 Human Population Growth And NaturalResources Interesting facts about the sun • The Sun is about 4 ½ billion years old now. It is • about 300 degrees hotter and about 6% greater in radius than when it was first born. • It will continue to increase in temperature, luminosity and radius at about the same rate for about another 5 billion years. • At that point the luminosity will be twice its present value and and will be 40% larger in radius. At this point there will be no more hydrogen in the core, forcing energy to take place in what is called a hydrogen burning shell. The core will start to contract as the outer layers expand.
16.1 Human Population Growth And NaturalResources • Next the Sun will rapidly swell and become a red giant star. • Within the next 250 million years it will expand to 100 times its present size and 500 times more luminous. • When the core temperature reaches 100,000,000 degrees Kelvin, all the rest of the helium will fuse into carbon in one big bang, causing one third of the solar envelope to be thrown out into space. • After this the Sun will become brighter and the outer layers will be blown out into space in the form of a dense solar wind known as a planetary nebula. At that point all that will be left is a white dwarf.
16.1 Human Population Growth And NaturalResources Effective management of Earth’s resources will help meet the needs of the future. • Earth’s resources must be used responsibly. • Careless use of resources makes them unavailable to future generations. • Easter Island is an example of irresponsible resource use. Easter Island
16.1 Human Population Growth And NaturalResources • An ecological footprint is the amount of land needed to support a person. • The land must produce and maintain enough – food and water – shelter
16.1 Human Population Growth And NaturalResources • An ecological footprint is the amount of land needed to support a person. • The land must produce and maintain enough – energy – waste
16.1 Human Population Growth And NaturalResources • Several factors affect the size of the ecological footprint. (1) amount of resources used (2) efficiency of resource use (3) amount of toxic waste (4) toxic waste produced eco footprint
16.1 Human Population Growth And Natural HW: 16.2 P. 488-492 5 Facts/PageResourcesStudy Guide Review 16.11. About how big is Earth’s population?2. Give two examples of technologies that have influenced human population growth.3. Write “renewable or non-renewable” next to each word: A. Sun B. Oil C. Trees D. Water E. Wind F. Corn G. Beef H. Coal4. Name one resource that was misused on Easter Island and two ways that they could have used the resource more efficiently.5. List the four factors that determine your ecological footprint.6. What is the difference between renewable and non- renewable resources?7. Explain two things you can improve on at home to reduce