Punctuation for Clarity in Complex Sentences

Very Hard Usage And Mechanics Punctuation

Although many climate experts agree that global warming is a serious threat, recent studies which show a decline in polar bear populations, particularly in the Arctic, suggest that changes in their environment are severely impacting their survival. This has led to a variety of responses from the scientific community, urging policymakers to take immediate action to mitigate these effects.

Which of the following sentences best uses punctuation to clarify the relationships between the ideas presented?

Although many climate experts agree that global warming is a serious threat; recent studies, which show a decline in polar bear populations, particularly in the Arctic, suggest that changes in their environment are severely impacting their survival.

Although many climate experts agree that global warming is a serious threat, recent studies that show a decline in polar bear populations, particularly in the Arctic suggest that changes in their environment are severely impacting their survival.

Although many climate experts agree that global warming is a serious threat, recent studies, which show a decline in polar bear populations, particularly in the Arctic, suggest that changes in their environment are severely impacting their survival.

Although many climate experts agree that global warming is a serious threat: recent studies that show a decline in polar bear populations, particularly in the Arctic, suggest that changes in their environment are severely impacting their survival.

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