Which of the following is an example of a positive feedback loop: I. As the Earth’s surface warms due to global warming, water evaporation from a lake will initially increase.  As the lake level drops, the surface area decreases and evaporation also decreases.
II. Water vapor from ocean evaporation creates low altitude clouds.  Sunlight that would normally warm the Earth’s surface is instead reflected back to outerspace.
III. Water vapor from ocean evaporation creates high altitude clounds.  Heat that would typically escape the atmosphere into outer space is trapped in the atmosphere instead.

I only

II only

III only

I and II.

I, II and III