 The IPCC, a United Nations panel, published its fourth Assessment Report in 2007, which laid out the panel's consensus on the current state of climate change worldwide. This was the most recent in a series of major summary reports, the first dating from 1990, which discussed the causes, effects, and possible ways to address climate change.
<coherence>  The IPCC, a United Nations panel, published its fourth Assessment Report in 2007, which laid out the panel's consensus on the current state of climate change worldwide. This was the most recent in a series of major summary reports, the first dating from 1990, which discussed the causes, effects, and possible ways to address climate change.
 The IPCC, a United Nations panel, 