Discussion of greenhouse effects has usually focused on whether the Earth would warm and by how much, but climatologists have indicated all along thatthe most obvious effects, and those that would have the largest impact on people, would be extremes of temperature, precipitation, and storminess .
Lets break the sentence:
Clause 1: Discussion of greenhouse effects has usually focused on - Discussion is the subject and has focused is the verb
Clause 2 : whether the Earth would warm and by how much
...
Lets break the sentence:
Clause 1: Discussion of greenhouse effects has usually focused on - Discussion is the subject and has focused is the verb
Clause 2 : whether the Earth would warm and by how much
...
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