I assign several meta-analyses in my grad courses. This approach is a reasonable way to make sense of a large number of studies that include some inconsistency in results. Recently, a summary of thousands of studies addressing climate change was released and well over 90% supported that human activities play a significant role.
A survey of thousands of peer-reviewed papers in scientific journals has found 97.1% agreed that climate change is caused by human activity.
Authors of the survey, published on Thursday in the journal Environmental Research Letters, said the finding of near unanimity provided a powerful rebuttal to climate contrarians who insist the science of climate change remains unsettled.
Some who would like to ignore this avalanche of data for political or economic gain are pretty much in the same camp still promoting smoking.