Back in 1998, a little known climate scientist named Michael Mann ... "warmer than any other year since (at least) AD 1400." The graph depicting this result looked rather like a hockey stick ...

On 23 April 1998, US climate scientist Michael Mann and two colleagues published a paper in Nature. Central to it was a graph that would become known as the “hockey stick”. This graph was ...

The “hockey stick” graph has been both a linchpin and target in the climate change debate. As a plot of average Northern Hemisphere temperature from two millennia ago to the present ...

Compared with graphs based solely on climate models, which tend to depict smaller and slower swings in temperatures, the new timeline is full of sudden spikes and abrupt shifts. But, in keeping ...

Note how the total adds up to 100%. Bar charts and line graphs can be combined. Climate graphs are an example of this. The x-axis shows the months of the year and there are two y-axes to show ...

A speaker in the clip claims the chart falsely inflates the impact of man-made climate change. However, the graph is a reliable marker of warming temperatures largely as a result of human activity ...