The ipcc neither conducts research nor does it monitor climate related data or other relevant parameters. It bases its assessment mainly on peer-reviewed and published scientific/technical literature. Selection of chapter teams based on expertise. Drafts are developed with multiple rounds of review. Line-by-line approval of summary for policymakers by governments. Presence of authors at approval ensures scientific accuracy. Summary for policymakers approved by 195 governments. The fifth assessment report of the intergovernmental panel on. Climate change (ipcc) 2013 made it clear that: Each of the last three decades has been successively warmer at the earth"s surface than any preceding decade since 1850. Northern hemisphere, 1983-2012 was likely the warmest 30 year period of the last 1400 years . Climate change is the fastest-moving area of environmental science today (cid:1) (cid:1) Trying to predict, based with the world dealing with climate change and. Different colours are based on the different greenhouse gases.