Chapter 6 Online quizzes

Except for CO₂, human food system activities are largely responsible for increasing the atmospheric greenhouse gas levels of which other greenhouse gases?

Nitrous oxide and methane

Methane and ozone

Hydrogen sulphide and nitrous oxide

Ozone and nitrous oxide

Approximately what percentage of food is wasted or lost across the global food system every year?

20 to 25%

40 to 45%

30 to 35%

50 to 55%

If we removed all forests globally (assume dark green colour) and replaced them with grasslands (assume light green colour), what would happen to the albedo and energy balance of Earth?

Albedo would decrease, more energy reflected by Earth surface and less absorbed.

Albedo would remain the same, no change in energy

Albedo would increase, more energy reflected by Earth surface and less absorbed.

Albedo would increase, less energy reflected by Earth, and more absorbed.

What percentage of artificial fertilizers is used to grow feed for livestock?

1%

12%

20%

27%

What is an important tool that scientists typically use to compare the different environmental impacts of products?

Life Cycle Assessment

Environmental Impact Assessment

Environmentally-Extended Input Output Analysis

Environmental Exergy Assessment

Why are food miles a concern?

Because it is always better to buy local, transporting food is a bad idea from a carbon emissions perspective.

Because although not all food miles are a problem, anything travelling by airplane is almost always worse.

Because refrigeration of food over long distances always results in more emissions than buying locally.

All of the given options are correct

What is the key challenge facing greenhouse gas emissions mitigation from the food system?

Food emissions are diffuse

Food systems emit many different types of greenhouse gases

Important mitigation strategies depend on social and cultural changes

All of the given options are correct

Climate change accounts for how much of the current yield variability (that is, food is grown year-to-year)?

10%

25%

75%

33%

What are Global Warming Potentials?

Thresholds beyond which the planet faces runaway climate change

The potential for global warming to occur locally

A way of comparing the effects of different greenhouse gases over time

A measurement of climate sensitivity to the concentration of greenhouse gases in the atmosphere.

What practice(s) does "carbon farming" include?

Planting trees

Reducing tillage

Efficient crop management

All of the given options are correct

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