Carbon Cycle and Human Impact

What is the primary focus of the activity described in the document?

• The impact of carbon dioxide on human health

• The movement of carbon between systems

• The economic effects of fossil fuels

• The history of carbon emissions

What are the components of the carbon cycle mentioned in the document?

• Geosphere, hydrosphere, biosphere, atmosphere

• Lithosphere, stratosphere, ionosphere, exosphere

• Troposphere, mesosphere, thermosphere, exosphere

• Hydrosphere, lithosphere, ionosphere, biosphere

The inputs and outputs 300 years ago: How much CO2 is being added to each system and how much is being removed?

• Equal input and output

• More input than output

• More output than input

• No change

Which reservoirs are holding more carbon now than they were 300 years ago?

• Oceans and forests

• Atmosphere and oceans

• Soil and rocks

• Ice caps and glaciers

How did human activity change the relationships between the geosphere, atmosphere, the biosphere, and the hydrosphere?

• Increased carbon storage in the geosphere

• Decreased carbon emissions to the atmosphere

• Enhanced carbon flow between the biosphere and hydrosphere

• Increased carbon emissions to the atmosphere