The Kyoto Protocol, made in 1997, aims to control greenhouse gas emissions globally. It suggests that reducing emissions should be cheaper than the potential damages from climate change. However, achieving these reductions economically might be tough. There's a risk that countries will move their emissions elsewhere to avoid limits or use unclear trading methods. The protocol doesn't strongly discourage countries from not following the rules or not joining. Fixing these issues will be hard, which could affect the protocol's success.