Greenhouse gases can be removed from the atmosphere by various processes, as a consequence of: 1  a physical change (condensation and precipitation remove water vapor from the atmosphere). 2  a chemical reaction within the atmosphere. 3  a physical exchange between the atmosphere and the other compartments of the planet.
What we can say is that the vast majority of people infected with HIV will develop AIDS sometime during their life (an average of 10 years or more after infection), and with early intervention and treatment, they could potentially live with AIDS for many years more.
Even without one of these infections, an HIV-positive person is diagnosed with AIDS if his or her immune system weakens, as indicated by the number of CD4 cells in his or her blood. A CD4 cell count less than 200 in an HIV-infected person gives someone a diagnosis of AIDS. It can take between 2 to 10 years, or longer, for an HIV-positive person to develop AIDS if he or she is not treated.