可以看看这篇用另一种图看趋势
The Hottest Weather Ever Visualized
New data graphics offer an alarming view of global climate change
STAFF By Amanda Montañez on August 17, 2016
http://blogs.scientificamerican.com/sa-visual/
the-hottest-weather-ever-visualized/
NASA Analysis Finds July 2016 is Warmest on Record
Posted Aug. 16, 2016
http://data.giss.nasa.gov/gistemp/news/20160816/
http://i.imgur.com/rVMnV4l.jpg
X轴为月份, Y轴为温度差异
只要暖化趋势继续,这累积的曲线图会产生更明显的彩虹
2016里约奥运开幕引用了另一种曲线图
http://www.climate-lab-book.ac.uk/spirals/