Students in Year 8 spend two lessons playing the roles of different people who have an interest in the Amazon rainforest in Brazil. For example some students are cattle ranchers, others native residents, and others might be tree logging companies. In character they investigate and debate how to develop the rainforest and whether the environment should be protected.
I don’t think any of them came up with the solution of nationalising the rainforest so that a government group would have the final say on all developments.
When you nationalise something you transfer ownership of an industry or part of an industry from private hands to state (government) ownership.
Maybe this wasn’t a solution because in the UK not much is still nationalised! British Rail used to be a nationalised rail company with all trains and tracks owned by the state. Nowadays you have private train companies who run different train areas which some people say makes prices go higher whereas others say it is just needed for investment to improve the train system.