Why struggling economies have a stake in COP21

With 190 states taking part in the Paris climate talks, there are clearly some for whom the outcome matters more than others. There are the small states, such as Kiribati and the Marshall Islands, for which a deal to reduce global emissions and curb climate change is a matter of survival. Then there are the big players, such as China, the US, Russia and the EU, upon which a deal will rely.