Question

1. The following questions are about climate change. Circle the right answer in the parentheses. (a) Most of the recent global warming is due to an enhanced greenhouse effect caused by increasing levels of greenhouse gases, such as (CO2, 02) (1 point) (b) (External, Internal) causes of climate change are those that alter the total amount of energy the climate system holds, whereas (external, internal) causes of climate change are those that redistribute energy within the climate system. Changes in the circulation patterns of the ocean and atmosphere is an example of an (external, internal) cause of climate change. (2 points) (c) Postive feedback mechanism is that tend to reinforce, weaken) the initial interactions among the variables, and negative feedback mechanism is the opposite. The water vapor-greenhouse feedback represents a (positve feedback, negative feedback) mechanism, because the initial increase in temperature allows (more, less) water vapor to evaporate into the atmosphere and water vapor is one of the greenhouse gases. (3 points)

Answer 1

1.

a. Most of the recent global warming is due to the greenhouse effect caused by increasing levels of greenhouses gases such as CO₂.

b. External causes are those that alter the total amount of energy in a climate system while the internal causes redistribute energy within the system. changes in the circulation of oceans and atmosphere is an example of an internal cause of climate change.

c. The positive feedback mechanism is that tend to reinforce the initial interaction among the variables, and the negative feedback is just the opposite. The water vapour greenhouse feedback represents a positive feedback mechanism because the initial increase in temperature allows more water to evaporate into the atmosphere.