The theory about the effect of global warming is Global climate is complex, so changes in global climate are hard to predict. The correct option is b.
What is global warming?
Global warming is a natural cause that is happening due to the trapping of greenhouse gases in the atmosphere. This happens when the rays from the sun come to earth, but the radiations are trapped in the atmosphere and increase the warmth of the earth.
The layers of pollution and the gases are increasing, and they are trapping the warmth and increasing the temperature of earth. The increased temperature is causing many destructed disasters to nature and people.
Thus, the correct option is b. Global climate is complex, so changes in global climate are hard to predict.
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