emitters of methane. solving that will be much harder. the countries who've signed up to this deal account for about half of global methane emissions. but there are some notable absences — namely china, russia and india — who haven't come on board. to achieve this 30% global target, we will need them to step up. but having more than 100 countries on board including some on board, including some of the largest emitters, and covering the vast majority of globally traded natural gas is a very big deal. this shows the levels of methane being released all around our planet. now, for the first time, there's a target to cut the greenhouse gas. at a conference trying to stop temperatures from rising above safe limits, this is a significant step for the world. rebecca morelle, bbc news, glasgow. the day's other major pledge puts trees, the earth's lungs, at the top of the agenda. the problem — deforestation. and the response — over 100 countries promising to end and then reverse deforestation,