Top 1% emit 50 tons of CO2 per year per person [1].
That's 8 billion * 1% * 50 tons = 4 billion tons per year.
Total annual CO2 emissions are about 35 billion tons [2].
Share of total emissions:
Ultra-rich (top 1%): 11%
Middle class (top 50% excluding top 1%): 77%
Poor (bottom 50%): 11%
Graph looks about right.