In the project description it is written that it will be based on green systems. What kind of system is it? I just did not understand the meaning...
The Greencoin project will focus on working with companies and projects that work in the field of environmental protection. that's what they mean by "green projects".
the main question is whether companies are ready to work with such projects on the blockchain remains open. since now green energy throughout the world exists largely due to subsidies, if the government tells them to do business with them, they will do it. otherwise they will lose money for development. while the sphere without legalization will not be anything good

Yes, legalization is needed to reach the state level. But any startup can go on the principle of "People's Money" - groundfacing. Perhaps when the project gets high publicity among users and citizens of some state, then the government can keep up with the times. For example, Switzerland supports almost all projects on the blockchain. Maybe you need to look for support there?