We have been increasing atmospheric CO2 since long before 1932 and Svante Arrhenius predicted that the burning of fossil fuels was increasing the earth's temperature back in 1896.
"It is very unlikely that climate changes of at least the seven centuries prior to 1950 were due to variability generated within the climate system alone. A significant fraction of the reconstructed Northern Hemisphere inter-decadal temperature variability over those centuries is very likely attributable to volcanic eruptions and changes in solar irradiance, and it is likely that anthropogenic forcing contributed to the early 20th-century warming evident in these records." - http://www.ipcc.ch/publications_and_data/ar4/wg1/en/spmsspm-...
Sea level has not changed at all in the past 200 years, I would dare to say they probably have not changed at all since the formation of the Mediterranean Sea.
On sea level, it is very simple, the moment the Dutch start fleeing The Netherlands, then I will start worrying; but if they are not buying land on the Himalayan, I will really not to worry about it.
CO2 has nothing to do with temperature of planets, whatsoever! And by the way, "greenhouse effect", the is commonly described, with irradiation and CO2, etc., does not exist!!! And call some gases in the atmosphere "greenhouse gases" is a stupidity that makes no sense whatsoever.
Volcanoes alone on any ordinary year (and last year was nothing ordinary) put at least five times more CO2 on the atmosphere than humans activities today!!! Insects, at least seven times more!!
So, no, humans are not that powerful. CO2 does not control climate. Arrhenius prediction is as much bogus as Malthus. There is no proof whatsoever, nor there can be since the whole scheme is a Physical impossibility.
CO2 is also not a pollutant, never was, never will!
All that said, yes we must find better and renewable sources of energy, since something that is not renewable will end someday. Moreover, our energy system is very inefficient (of course is a Physical impossibility to have 100% efficiency, but we should try harder).
Notwithstanding, some of the apocalyptic scenarios proclaimed may indeed come to happen, because climate (noun) changes (verb). That is what it does. If it stops changing than we would have a problem because that would be not normal! It has been cold before, it has been hotter before. Places that today are land has been under water. Deserts had been green. The planet is in constant change. We do not understand much of the process and that is the reality, not a bogus, deceitful, and damn right ridiculous idea that goes against even the most basics concepts of Physics. Any high school kid should be able to point right at it, were it not so wrapped up in fallacies.