One of the main effects of increased Greenhouse gas emissions is global warming. Aside from that, there are many other effects coming from a high concentration of these gases. Sulfuric (acid) rain, Ocia acidification, smog and ozone pollution, ozone layer depletion. All of these items have a direct impact on human activity and life.
Following are a couple of charts showcasing global emissions of GHG's and Carbon dioxide. GHG's include: Water vapor (H2O)Carbon dioxide (CO2)Methane (CH4) Nitrous oxide (N2O)Ozone (O3)Chlorofluorocarbons (CFCs)Hydrofluorocarbons (incl. HCFCs and HFCs)
Ocean acidification is the ongoing decrease in the pH of the Earth's oceans, caused by the uptake of carbon dioxide (CO2) from the atmosphere. Seawater is slightly basic (meaning pH > 7), and the process in question is a shift towards pH-neutral conditions rather than a transition to acidic conditions (pH < 7).