The African continent is the biggest and most populous after Asia (UN DESA 2013). It is also one of the most vulnerable to climate change, because it is highly exposed to many climate-related risks and has low adaptive capacity.
These are the top climate-related regional risks for Africa (click to see large version).
Image credit (satellite image of African continent only): NASA/JPL-Caltech; source: http://photojournal.jpl.nasa.gov/catalog/PIA04965. File is in public domain.