It's important to state that with all these negotiations, the entire process is an abject failure. The emission of green house gases continues to increase and extreme weather is noticeably increasing with the increased temperatures (Deadly heat waves in the Pacific North West US and Europe, the flooding of huge areas of Pakistan, etc, etc). Claims of "reasons for optimism" involve "less CO2 increase per increase in economic activity", a "gain" that could keep "improving" forever as C02 pollution continues at the present disastrous rate.