Your second sentence is absolutely correct. The global warming now, and in the past, is caused by an increase in volcanic activity, particularly subsea rifting. That is why the increase in carbon dioxide always LAGS the historical temperature changes. Human destruction of forests (deforestation) is resulting in the present carbon dioxide buildup, although there has been a slight increase in undersea rifting.
Government of the major, and some minor, powers with navies know this to be true.
