Climate scientists looking at data from 2010 think the warm weather phenomenon El Niño combined with global warming could make for a hot summer—the hottest ever. "'We have seen rapid warming recently, but it is an example of natural variation that is associated with changes in the Pacific rather than climate change. However, this warming is in addition to the 0.7C long-term rise in global temperature caused by climate change. The record temperatures are due to the two factors adding together.'"