Populations Understanding Populations Measuring Populations Human Population Growth.
Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental...
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Transcript of Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental...
![Page 1: Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental resource important to human populations: WATER When populations.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649e755503460f94b77264/html5/thumbnails/1.jpg)
Welcome to Planet Earth
![Page 2: Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental resource important to human populations: WATER When populations.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649e755503460f94b77264/html5/thumbnails/2.jpg)
SustainabilitySustainability
• In this course we will focus on one environmental resource important to human populations: WATERWATER
• When populations grow too large, they can exploit all resources in a region and are then forced to emigrate
• Can you picture a world in which there is no room or resources for human life?
![Page 3: Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental resource important to human populations: WATER When populations.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649e755503460f94b77264/html5/thumbnails/3.jpg)
Population Growth
• There are approximately 5.8 billion people in the world
• The global birth rate is about 27 births per 1000 people per year
• How many babies were born in the last 3 minutes?
• What additional information would you need to know to calculate the increase in world population over the past 3 minutes?
![Page 4: Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental resource important to human populations: WATER When populations.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649e755503460f94b77264/html5/thumbnails/4.jpg)
Projected population growthProjected population growth
Figure 1.12 on page 12
![Page 5: Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental resource important to human populations: WATER When populations.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649e755503460f94b77264/html5/thumbnails/5.jpg)
Why are there regional differences in population growth?
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Where do most people live? Why?
![Page 7: Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental resource important to human populations: WATER When populations.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649e755503460f94b77264/html5/thumbnails/7.jpg)
Population density in the Mid- Atlantic Bight
![Page 8: Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental resource important to human populations: WATER When populations.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649e755503460f94b77264/html5/thumbnails/8.jpg)
Earth is always changingEarth is always changing
• Some changes happen on time scales we can observe: the tides rise and fall, the seasons change
• Other changes occur over long time periods and we must infer their presence: mountains are built and eroded, plants die and become fossil fuel
• Most resources on Earth are created much more slowly than we consume them
![Page 9: Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental resource important to human populations: WATER When populations.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649e755503460f94b77264/html5/thumbnails/9.jpg)
Geochemical CyclesGeochemical Cycles
• What is a cycle?
• Reservoirs in the water cycle
• Fluxes in the water cycle
• Box models
![Page 10: Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental resource important to human populations: WATER When populations.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649e755503460f94b77264/html5/thumbnails/10.jpg)
How do you know a How do you know a cycle when you see cycle when you see
one?one?
What are some What are some everyday examples of everyday examples of
cycles?cycles?
![Page 11: Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental resource important to human populations: WATER When populations.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649e755503460f94b77264/html5/thumbnails/11.jpg)
Dictionary definition of cycle:Dictionary definition of cycle:
Any period of time or complete process of growth or action that repeats itself in the same order
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The basics of a geochemical cycleThe basics of a geochemical cycle
• Reservoirs - a place where the matter accumulates
• Fluxes – transfer of matter from one reservoir to another
• Residence time – the amount of time an average “piece” of matter (molecule, atom) resides in the reservoir.
![Page 13: Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental resource important to human populations: WATER When populations.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649e755503460f94b77264/html5/thumbnails/13.jpg)
Residence time is calculated:Residence time is calculated:
Amount of matter in reservoir
Removal rate (or supply rate)
Let’s create our own example!
![Page 14: Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental resource important to human populations: WATER When populations.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649e755503460f94b77264/html5/thumbnails/14.jpg)
Focusing on the hydrologic cycle
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Major reservoirsMajor reservoirs
• Oceans 97.5%
• Glaciers 1.81%
• Surface water (lakes, streams) 0.016%
• Soil moisture 0.005%
• Atmosphere 0.001%* Nearly all of the water on earth is in the ocean and glaciers
![Page 16: Welcome to Planet Earth. Sustainability WATERIn this course we will focus on one environmental resource important to human populations: WATER When populations.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649e755503460f94b77264/html5/thumbnails/16.jpg)
Major fluxesMajor fluxes
• Condensation
• Precipitation
• Infiltration
• Run-off
• Evapotranspiration
We will define each of these today and then spend the next few weeks talking about each in detail.