Germany is the textbook example of this: in 2010 they started the Energiewende and declared enormous investments in solar projects like DESERTEC, reduction of CO2 but most importantly - closure of nuclear power plants.
In 2020 the only thing that worked was the last one - CO2 emissions per capita are 2x more than France, energy emissions per kWh are 5x than France, on-shore wind farms have stalled, DESERTEC was abandoned.
In 2018 Greenpeace said we need more fossil gas...