Renewable sources of energy should be used instead. Natural resources are being exploited at an alarming rate.
A.Renewable sources of energy should be used instead, however, natural resources are being exploited at an alarming rate.
B.Renewable sources of energy should be used instead since natural resources are being exploited at an alarming rate.
C.Renewable sources of energy should be used instead; therefore, natural resources are being exploited at an alarming rate.
D.As renewable sources of energy should be used instead, natural resources are being exploited at an alarming rate.

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