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.
Brazil is fully running on renewable energy? I haven't heard about that and it comes as bit of a surprise to me given how large and how many people are living there. Most of the other areas are fairly small with only a small population. In my opinion it really comes down to area where you are living, not everywhere is solar energy efficient, same goes for wind energy. It's much more profitable to build large wind turbines offshore where there is more wind. It's definitely possible to convert the whole world to renewable energies, but it's not going to happen in a few years. It's going to take large amounts of money to invest all around the world and many of the poorer countries won't be able to invest that kind of money. At the moment I don't really see a political solution where the whole world would work together to stop using fossil fuels. It's sad but we probably need more extreme weather before there will be enough pressure for the big countries to react.