What's In It For the 'Leaders'?

Activist Greta Thunberg complains that 'there are no real climate leaders yet' and asks 'who will step up at Cop26?' (https://www.theguardian.com/commentisfree/2021/oct/21/climate-leaders-cop26-uk-climate-crisis-glasgow). Thunberg is certainly correct when she says:- a) the science is clear and b) most world leaders are in denial. I suspect, however, that she hasn't yet developed my degree of cynicism (I have had much longer to hone this awful attribute). It seems to me, that the main aim of all 'world leaders' is to achieve power (by inheritance, success in elections or by force). Once power is grasped, all 'leaders' want to hang on to it (only, of course, for the 'good' of their country). A 'leader' 'stepping up' in Thunberg's sense at Cop26, would be showing extreme altruism (not something in the 'skill-set' of the vast majority of politicians). Greta seems to believe/hope that, the arrival of a real climate leader, would embarass his/her counterparts from other countries to fall into line. I am not so sure. The 'world leaders' gathering in Glasgow (and those simply sending delegations), appear happiest when they are making optimistic 'pledges' and trying to convince their people that they have won something in talks. Some, even invent cost-free scenarios for the future, based on little or no evidence.