Here are the IPCC Projections:

Scenario Population

Economic Growth
to 2025/to 2100

Energy
IS92a 11.3 B by 2100 2.9/2.3% AKA "Business As Usual"
IS92b as "A" as "A"

As A but with CO2 Stabilization,
like the Kyoto Protocol

IS92c

UN Medium Low Case:
6.4 B by 2100

2.0/1.2% as "A"
IS92d UN Medium Low 2.7/2.0%

Halt Deforestation
Capture CO2 from power plants

IS92e 11.3 B by 2100 high: 3.5/3.0%

Phaseout of Nuclear by 2075
30% carbon tax

IS92f UN Medium High: 17.6 B by 2100 as "A" as "E"