Clunky is a word that is used to describe something that is not very smooth or elegant. Clunky things often have a lot of parts that don't fit together very well.
The riskiest thing that you can do is to take a risk. When you take a risk, you are gambling with something important.
To propel something is to push or move it forward. A rocket propels itself forward by using a fuel that is stored inside the rocket.
To revolutionize something is to change it completely. When the government starts to revolutionize, they are changing the way that the country is run.
Wickedly is adverbially. When something is wickedly, it is extremely bad. The weather is wickedly cold.
Emitters are objects that release something into the atmosphere. Cars emit pollution, and factories emit toxic chemicals.
Sustainably means in a way that doesn't damage the environment or the Earth's resources. It's important to be sustainable because it's not healthy for the planet to continue using resources in the way that we are currently doing.
To catalyze something is to cause it to start working. When you catalyze a reaction, you make it happen faster than it would normally happen.