Climate change has a long history. Scientists have been warning about rising temperatures and carbon dioxide levels since the 1960s. However, it took a couple of decades before governments started moving. The Intergovernmental Panel on Climate Change (IPCC) was set up in 1988, and two years later, further international cooperation materialized at the Rio Earth Summit, when the United Nations Framework Convention on Climate Change(UNFCCC) was established to stabilize greenhouse gases. Here’s a look at the numbers that explain the politics of climate change and what countries have promised so far.