As many people say, climate change is constant, however, it would be naive of us to assume that humans haven't had an impact. NASA's extensive scientific research, for instance, shows that there's a 95% likelihood that humans have contributed to climate change. If referring to global warming specifically, research suggests that there was consistent change in the earth's temperature until the early 20th century and then, assuming industrial developments by humans had an impact, that temperature change was then accelerated considerably. The U.S. National Academy of Sciences states, "The scientific understanding of climate change is now sufficiently clear to justify taking steps to reduce the amount of greenhouse gases in the atmosphere," which shows that there is scentific belief in climate change and steps are being taken to reduce it. Similarly, an IPCC study (2001) declares: "It is likely that most of the warming in recent decades can be attributed to human activities." It seems that scientists around the world agree that climate change is occuring but some disagree about whether it is associated with humans or whether it is just part of the earth's cycle.
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