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74 F to 84 F is not much. As far as I know temperatures beyond 86 F cause coral bleaching in reefs.
Does this Wikipedia article and this graph answer some of your questions? Please also see links to related articles at the end of the article. CO2 emissions/concentrations and global warming are not such simple, both are very complex processes which are not completely understood yet, for example the role of the oceans and the deep sea. Anthropogenic CO2 emissions are relatively small but they cause a large deviation from the steady state of the closed atmospheric carbon cycle. If this emission would stop at least a new steady state instead of an permanent increase could form. Further global warming could initiate an avalanche of positive feedback reactions like thawing permafrost, more release of CH4 and CO2 further fueling the warming and so on.
Does this Wikipedia article and this graph answer some of your questions? Please also see links to related articles at the end of the article. CO2 emissions/concentrations and global warming are not such simple, both are very complex processes which are not completely understood yet, for example the role of the oceans and the deep sea. Anthropogenic CO2 emissions are relatively small but they cause a large deviation from the steady state of the closed atmospheric carbon cycle. If this emission would stop at least a new steady state instead of an permanent increase could form. Further global warming could initiate an avalanche of positive feedback reactions like thawing permafrost, more release of CH4 and CO2 further fueling the warming and so on.


