However, favorable U.S. government policy, most notably the tax credits and funding available from the Inflation Reduction Act (IRA), is a catalyst that could spark a renewed interest in clean energy. An investment in decarbonization The First Trust Nasdaq Clean Edge Green Energy Index Fund is big in its own right, with $1.7 billion in net assets. Overall, it's arguably a bit riskier and less diversified than the iShares Global Clean Energy ETF, but may be better suited for investors targeting a higher concentration of U.S.-based companies.