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Of course they do. So does volcanic activity, plate tectonics and ocean currents. There are lots of things that affect earths climate. Man just might be one of them.
Man puts out a very small part. We have very little effect on climate.
Global Warming: A closer look at the numbers
Human activites contribute slightly to greenhouse gas concentrations through farming, manufacturing, power generation, and transportation. However, these emissions are so dwarfed in comparison to emissions from natural sources we can do nothing about, that even the most costly efforts to limit human emissions would have a very small-- perhaps undetectable-- effect on global climate.