Which of the following is a correct example of global warming

Q1 Which of the following is a correct example of global warming creating negative feedback?

1. Ice has a higher albedo than water so replacing ice with water causes the surface to warm.
2. Ice has a lower albedo than water so replacing ice with water causes the surface to warm.
3. Less water evaporating will create more low-level clouds causing the surface to warm. 
4. More water evaporating will create more low-level clouds causing the surface to cool.

Q2 Which of the following is a correct example of global warming creating positive feedback?

1. Ice has a higher albedo than water so replacing ice with water causes the surface to warm.
2. Ice has a lower albedo than water so replacing ice with water causes the surface to warm.
3. More water evaporating will create more low-level clouds causing the surface to warm.
4. Less water evaporating will create more low-level clouds causing the surface to warm.

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