NASA animation of temperature data summarizes over 100 years of climate change.

In just 27 seconds, NASA has presented one of the most effective summaries of our warming climate available anywhere on the internet. Using reliable instrumental data, this quick video captures the tail end of the Little Ice Age (depending how you want to date it), the rise in early twentieth century temperatures, the brief cooling of the early 1940s, and the longer cooling of the 1960s and '70s. Then, the final 10 seconds of the graph reveal how the rising concentration of atmospheric greenhouse gases is rapidly heating our planet, particularly at the poles. Relevant to that polar heating: this year's shocking Arctic ice melt, and the building awareness that the North Pole's sea ice is likely melting 50% faster than was predicted by most scenarios previously developed by scientists.