The best way to become a Gremintal is to create your own projects and work on them! A project that I am currently working on is to produced biodiesel, a renewable diesel fuel, using algae. You can read more about it here!
Project Ideas (Increasing difficulty)
Learn about the effects of light pollution by turning off all lights and appliances for an hour!
Go outside and look up at the night sky!
Investigate your energy and resource use. How much electricity and water do you use? Where does the electricity come from? Is it produced from renewable energy sources such as solar power, wind power, or hydropower?
Repurpose pens and pencils you usually throw away by turning them into beautiful artwork.