How has climate change science evolved since Al Gore's 'An Inconvenient Truth'?

Since Al Gore's film 'An Inconvenient Truth' was released nearly 20 years ago, the science has only strengthened, showing that the rate of warming since the mid-20th century is indeed unprecedented. The evidence accumulated over these two decades consistently confirms what Gore highlighted in his documentary. All available data points to the same conclusion: our planet is warming at an alarming rate. The additional years of research and observation have reinforced the original climate change concerns while providing even more compelling evidence of the ongoing global temperature increases.