According to the 2014 report of the Intergovernmental Panel on Climate Change, what is a "very likely" conclusion?

The conclusion identified as "very likely" by the 2014 report of the Intergovernmental Panel on Climate Change, concerning human-caused emissions being the main factor causing warming since 1951, is supported by extensive scientific evidence and consensus. This assertion is based on a comprehensive review of climate data, modeling, and observations indicating that the significant increase in greenhouse gases, particularly carbon dioxide and methane, correlates closely with human activities such as fossil fuel combustion and deforestation. These activities have led to a marked increase in atmospheric concentrations of these gases since the mid-20th century, directly contributing to global warming and climate change.

The phrase "very likely," which indicates a probability of 90% or greater, reflects the high level of confidence in this conclusion among climate scientists, underscoring the importance of differentiating between natural and anthropogenic (human-induced) factors in climate change discussions. The overwhelming majority of climate models and observed data support the notion that human activities have been the primary driver of recent climate trends, distinguishing this conclusion from assertions of natural or volcanic causes, which do not account for the rapid changes observed since the mid-1900s.