. >> ban kee moon. i think it's hugely significant. you know, like a lot of people, i think climate change had been over there. desirable to get them over -- i think the deniers, their day is over. we've got to take action, and we've got to do it fast. >> this is "talk talk to al jazeera" still ahead, peter gabe bre yell talks about his retrospective tour, back to front. thanksgiving day marathon. on al jazeera america. >> on the stream >> csi environment we talk with scientists who helping to pinpoint pollution culprits by creating a way to fingerprint fracking waste water >> the stream only on al jazeera america >>> i am ali velshi. you are watching "to talk to al jazeera" my guest is peter gabe bre yell with richard branson, he helped create elders, a group of elder statesmen that works for global peace. >> you were having a conversation one day with richard branson, and you -- it seems like your -- you have these moments in your life where you decide that change is required and you are going to go really big with change. this yd of

ban kee moon says the world can limit climate change. >> if we act now, immediately and decisively, wee the means to build a better and more sustainable world. many tools and technologies are already available. renewable energy sources are increasing economically competitive. energy efficiency has long proven its value. action on climate change can contribute to economic prosperity better health and more liveable cities while reducing the risk of further be deniggr deniggridation. >> i spoke to the icc. who's leader is confident they can cut out. >> what we have brought out in this report is the fact if the world wants to limit temperature to two degrees celsius or less, by the end of the century, we would need to ensure that emissions are below zero or, at worst, at zero. so, therefore, it's very clear tot that the world has to look at that pos expect and it also has to look at what we need to do by 2050 and in 2050, what we have said is that emissions will have to reduce between 40 to 70% below the levels that existed in 20s 10. and this would require tripling or quadrupling energy s

. >> ban kee moon. i think it's hugely significant. you know, like a lot of people, i think climate change had been over there. desirable to get them over -- i think the deniers, their day is over. we've got to take action, and we've got to do it fast. >> this is "talk talk to al jazeera" still ahead, peter gabe bre yell talks about his retrospective tour, back to front. >> on the stream >> csi environment we talk with scientists who helping to pinpoint pollution culprits by creating a way to fingerprint fracking waste water >> the stream only on al jazeera america real reporting that brings you the world. giving you a real global perspective like no other can. real reporting from around the world. this is what we do. al jazeera america. >> we're following stories of people who died in the desert. >> the borderland marathon. >> no one's prepared for this journey. >> experience al jazeera america's critically acclaimed original series from the beginning. >> experiencing it has changed me completely. >> follow the journey as six american