Not surprisingly, there exists a climate change "denial lobby", funded to the tune of tens of millions of dollars by sectors of the hydrocarbon industry, and highly influential in some countries. This lobby has understandable similarities, in attitudes and tactics, to the tobacco lobby that continues to deny smoking causes lung cancer, or the curious lobby denying that HIV causes AIDS. Earlier, when some aspects of the science were less well understood, they denied the existence of evidence that human inputs of carbon dioxide and other greenhouse gases were causing global warming. More recently, there is acknowledgement of anthropogenic climate change, albeit expressed evasively, but accompanied by arguments that the effects are relatively insignificant, and/or that we should wait and see, and/or that technology will fix it anyway.