Final answer:
The IPCC stated in a report in 2007 that the scientific evidence for global warming was strong and unequivocal. This means that the evidence supports the conclusion that global warming is happening and is not weak or inconclusive. Additionally, global warming is not only observed in some regions, but it is a worldwide phenomenon.
Step-by-step explanation:
The IPCC stated in a report in 2007 that the scientific evidence for global warming was strong and unequivocal (option A). This means that the evidence supports the conclusion that global warming is happening and the cause is not weak or inconclusive (option B). The report also concluded that global warming is not only observed in some regions, but it is a worldwide phenomenon (option D).