iShares Global Clean Energy ETF (ICLN) currently warrants a hold rating due to several barriers facing the global clean energy industry. While the long-term outlook for clean energy is promising, near-term challenges in U.S., European, and Asian markets are impeding growth. High costs for clean energy, stunted demand, and the prevalence of fossil fuels are significant roadblocks. Investors should be aware of the volatility associated with ICLN and similar ETFs, as they tend to experience more fluctuations than the broader market.