I opened $Energy Select Sector SPDR Fund(XLE)$  ,This is a disciplined dollar cost average strategy (DCA) into the Energy Sector.The Energy Sector, as defined by GICS, comprises companies engaged in exploration & production, refining & marketing and storage & transportation of oil & gas and coal & consumable fuels. It also includescompanies that offer oil & gas equipment and services.The underlying index is designed to measure the performance of the oil and gas sectors in the world, with focus on the Value and Large securities.The fund invest ~ 95% into the underlying index.I am of the opinion that green energy will not be able to replace Oil and Gas anytime soon.This ETF is also good because it gives exposure to these good companies with a low expense ratio of 0.08%.Its top components include Exxon Mobil, Chevron, ConocoPhilips, EOG, etc. These are big corporations with fat margins and good cash cushions that are in good positions to weather through any crisis.