National environmental funds have evolved over time in several countries. Traditional environmental funds were established in the late 1980s and funded by pollution charges and fines, but have increasingly been consolidated into national budgets. Newer specialized clean energy funds have been established since the 2000s to support specific sectors like renewable energy. These specialized funds tend to be better funded through initial equity investments and grants, and use financial instruments like loans and grants to leverage private sector funding for larger clean energy projects.