How to store excess CO2 underground?

Nuclear waste need to be stored in special container to avoid contamination of the environment. Co2 level is rising in the atmosphere at a rate of about 2 molecules per million. CO2 emitted from thermal power plants and industrial areas through chimneys should be more amenable for storage. Today 25% of total world wide co2 emission is due to thermal power plants. The number is expected to double in the next decade. Everyone is aware of consequences of co2 in the atmosphere. Co2 absorption in sea acidifying sea water etc. In order to have equilibrium in CO2 cycle enough green cover is required. Less green land mass means excess co2 in the atmosphere and more G.W. resulting climatic change, melting of polar ice, raising sea level which may destroy civilization. Thinking all the consequences some how co2 needs to be curbed or stored underground.