Page "Global warming controversy" Paragraph 1

Primary issues concerning the existence and cause of climate change include the reasons for the increase in global average air temperature, whether the warming trend is unprecedented or within normal climatic variations, whether humankind has contributed significantly to it, and whether the increase is wholly or partially an artifact of poor measurements.

Scientists have resolved many of these questions decisively in favour of the view that the warming trend is unprecedented, that human activity is the primary cause and that it has been accurately measured.

Additional disputes have concerned estimates of climate sensitivity, predictions of additional warming, and what the consequences of global warming will be.

Although the primary issues are regarded in the scientific literature as settled, these secondary issues are still the subject of mainstream scientific debate.