For some time I've been looking for software that will produce maps of the world where the size of territories is distorted by some relevant metric (population, carbon emissions, GDP per head etc). Now I've found the World Mapper project, which while it doesn't let me upload my own data or generate my own maps has got a wide selection to look at.

Here's a map of known species extinctions since 1500 CE (current era)

This map shows the amount of growth in forests in various countries around the world. As you can see China and the US seem to lead in reforestation.

While this one

shows the losses. What it doesn't show is that the losses are about four times more than the growth. Take a look around the site, it's interesting stuff.