The United Nation's Inter-governmental Panel on Climate Change, of which India is one of the 195 members, has released its sixth assessment report today. Scientists are observing changes in the Earth's climate in every region and across the whole climate system. Some of the changes already set in motion - such as continued sea level rise - are irreversible over hundreds to thousands of years. Yet drastic and rapid cuts in carbon dioxide and other greenhouse gases can limit climate change, but nations have to agree to do this.