Human influences on the environment

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Question 49
Medium

Plants and algae absorb greenhouse gases from the atmosphere to produce organic molecules.

a.

Give the balanced chemical symbol equation for photosynthesis.

[2]
b.

The table below shows estimated global carbon dioxide (CO2\text{CO}_2CO2​) emissions specifically from commercial aviation between 1990 and 2018.

YearMass of CO2\text{CO}_2CO2​ released (millions of tonnes)
1990540
2000690
2010780
2018918

Calculate the percentage increase in the mass of CO2\text{CO}_2CO2​ released globally from commercial aviation between 1990 and 2018.

[3]
c.

Give three negative environmental effects of global warming resulting from increased levels of greenhouse gases in the atmosphere.

[4]
d.

Explain how protecting and restoring peat bogs can help limit the increase of atmospheric carbon dioxide.

[3]

Human influences on the environment Questions

  1. IGCSE
  2. /Biology
  3. /Human influences on the environment