I recently came across #ShowYourStripes, a website that offers a variety of charts to help visualize the extent of global heating over the past 150 years. Here, for example, is a bar chart of global temperature change (relative to the average temperature for the period 1961–2010):
It really underlines the acceleration in global heating since the late 1970s.
One particularly nice feature of the site is that you can use it to generate charts of average temperature change for different regions, countries, and even cities around the world.