Sustainability is a deceptively complicated term that touches virtually every part of the economy. But simply put, investing in clean energy is centered around the belief that the global energy mix will continue to incorporate fewer fossil fuels and more low-carbon solutions. This can mean renewable energy like solar, wind, and hydroelectric power. But it can also include emission reductions across the oil and gas industry, hydrogen blending with natural gas, and other efforts.

With net assets of $817.9 million, the Invesco WilderHill Clean Energy (NYSEMKT: PBW) exchange-traded fund (ETF) isn't the largest ETF out there. But it has a lot of characteristics that investors may be drawn to. Here's why it is my top ETF to buy now.

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Source Fool.com