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In conclusion, it is possible for the world to be 100% dependent on renewable energy, but it would require a significant transformation of the current energy system and a collective effort from all stakeholders. Some countries and regions have already achieved or are close to achieving this goal, such as Iceland, Brazil, New Zealand’s South Island, Denmark’s Samsø island, and Germany’s Mecklenburg-Vorpommern and Schleswig-Holstein regions. These examples show that 100% renewable energy is not only feasible but also desirable for a sustainable future.
with the increasing effect of greenhouse gases in our atmosphere, making global warming increasingly uncontrollable, renewable energy is something that the earth really needs right now, but it is not easy to realize a world that uses 100% renewable energy, there are many factors that influence it; like politics, just imagine if the use of oil or coal is stopped then oil or coal entrepreneurs will no longer be able to make a profit, so they are as many as possible lobbying leaders in developing countries to continue to depend on oil and coal, Pollution in several big cities is also quite worrying. As recently happened in Jakarta, so far no one cares about the air in Jakarta, the residents are only busy with their own interests and the government doesn't care about that even though the carbon gas created by the daily activities of Jakarta residents is quite worrying.
You made a very strong point here when you mentioned about the politics that's involve when considering those countries hat economy depends on crude oil the "OPEC" countries the idea of renewable energy development despite how it sounds good for the climate against the effect of green house gases on the global environment
to the oil producing countries it's a bad business for them and that's why the world at large will not be taken over by renewable energy even in the next 50 years because there's a strong politics underground from those OPEC countries.
As for atmospheric population generation from oil and coal I think same can be talked about with renewable energy like hydropower plants, where is the waste deposited and what are the health effect is a question we have not asked ourselves.