Global Carbon Footprint by country. This information may be about 10 years old. Plus, a per capita carbon footprint is a more accurate picture. For example China has the highest total carbon emissions, but the USA has a much higher per capita rate.
Should You Send That Email? Here's A Flowchart For Deciding This is a chart full of stats about email flow at work. Not sure the chart is useful for my kind of work, but the knowledge is great to have!