The best-performing exchange-traded fund of 2019 thus far is a pure-play solar ETF that’s up about 60% — and another top performer is a clean energy ETF that has gained about 35%. Why might investors want to consider solar and clean energy ETFs despite the fact that, as the author of today’s article acknowledges, “These ETFs are usually quite volatile since their fortunes are tied to government subsidies and oil prices” – and what role can niche ETFs such as these play in a portfolio? CLICK HERE.