Does anyone know exact figures how much CO2 is emitted by burning Fossil Fuel every year ? I have some figures like 4.5 Billion tonnes of CO2 is emitted every year is that ture .

If there are no Trees to take in this CO2 where is all the CO2 going , Is that causing Global warming like it happens on Mar Surface where there is 50 % of CO2 in MARS air that increase Day temparatures to 345 Degree C.

It is not just the trees, but every green plant. That is why there is very little CO2 on earth. The green plants need CO2 just as U do oxygen.