Two international assessments have been published by the Urban Climate Change Research Network at The Earth Institute at Columbia University.[22] The first of which was published in, the first of which (ARC3.1) was published in 2011,[23] and the second of which (ARC3.2) was published in 2018.[22] These papers act as summaries of the scholarship for the field similar to the Intergovernmental Panel on Climate Change reports. A third report is being developed as of 2020.[24]