This ETF offers a unique way to play clean energy, focusing on companies that focus on greener and generally renewable sources of energy and technologies that facilitate cleaner energy. So the sector exposure profile of PBW may differ from funds such as ICLN; PBW is heavy in tech companies, spreading the rest of the exposure across industrials, materials, consumer companies, utilities, and even health care firms. With this ETF in particular, it is important to take a close look at the underlying holdings and not make assumptions about the factors that will impact the risk/return profile. PBW is a very specialized product that may appeal to a very narrow investment thesis. The price tag for PBW is a bit hefty, but there are no real alternatives to the exposure this fund delivers.