have not signed up. coal is the single biggest contributor to climate change. let's talk to riccardo puliti, vice president for infrastructure at the world bank, and someone who has written about the global challenge of moving away from coal. thank you very much forjoining us. what do you think, how significant is this pledge for a0 countries to move away from coal fired power stations? ,., ., move away from coal fired power stations? ., , , stations? good morning. it is very relevant. stations? good morning. it is very relevant- as _ stations? good morning. it is very relevant. as you _ stations? good morning. it is very relevant. as you said, _ stations? good morning. it is very relevant. as you said, coal - stations? good morning. it is very relevant. as you said, coal is - stations? good morning. it is very relevant. as you said, coal is the l relevant. as you said, coal is the biggest emitter of c02, it is a major contribution to climate change and it is really necessary that as many countries as possible have a transition away from coal. it is necessary to retire coal assets, re—purpose the assets where coal was placed, to make sure the population and the workers are treated in a fair way so that we have all the consensus necessary to move away