evidence: Inaccurate: There is, in fact, a clear relationship between temperature and human-caused emissions of CO2 and other greenhouse gases. [...] They do. Since 1970 the correlation is extremely strong: almost 90% of all temperature change correlates with human emissions. About 0.2% correlates with solar activity, and even that is nonsense because temperatures went up while we measured the Sun getting cooler. [...] It is true that water vapour is a main greenhouse gas, but the amount of water vapour is also tightly related to temperatures (and should therefore be seen as an enhancing feedback, not a driver). That is, higher CO2 will increase temperatures, which will increase water vapour, which will increase temperatures… To write that "carbon dioxide has had a minuscule effect on global climate" is of course utter nonsense—see other comments.