The following question , consists of an incomplete sentence or a sentence which is split into four parts. All four parts are jumbled up and are named as P, Q, R and S. These four parts are not given in their proper order. Arrange the jumbled parts of the sentence and find out which of the four combinations from the given options will correctly complete the sentence. P. However, the recent warming trend is happening much faster than it ever has. Q.Past changes in Earth’s temperature happened very slowly, over hundreds of thousands of years. R.   The amount of warming we have experienced in such a short time—only human activities can account for it. S.   Natural cycles of warming and cooling are not enough to explain .