Lecture 7 Flashcards

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1
Q

The Carbon Cycle

Summary

In the biosphere

A
  • Photosynthesis removes carbon from the abiotic environment and incorporates it into biological molecules
  • Cellular respiration, combustion of fossil fuels and wood, and weathering of limestone returns the carbon to the water and atmosphere of the abiotic environment
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2
Q

CO2 concentrations have _____ exponentially over the last 200 years

A

CO2 concentrations have increased exponentially over the last 200 years

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3
Q

CO2 in the atmosphere traps heat and creates the _______________

How?

A

CO2 in the atmosphere traps heat and creates the greenhouse effect

Incident radiation is absorbed by the earth’s surface and transmitted back to the atmosphere at longer wavelengths

  • These longer wavelengths are absorbed by CO2, other greenhouse gases, and water vapour and then converted to heat
  • This prevents the radiant energy from escaping from the atmosphere back into space
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4
Q

Major greenhouse gases

A

CO2, CH4 and N2O

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5
Q

__% of Bangladesh’s area and __ million of its people live in areas less than 1 m above sea level (asl)

A

7% of Bangladesh’s area and 6 million of its people live in areas less than 1 m above sea level (asl)

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