The most common form of life, pound for pound, on Earth isn't humans, or ants, or any of the other multitudes of life we're all familiar with. It's bacteria. So tiny as to be invisible to the naked eye, bacteria swarm across every inch of every surface. Trillions of pounds of bacteria float through the air. The growth of plants is only possible due to the innumerate bacteria in the soil that fix nitrogen in the air into nitrogen compounds in the soil that plants can use.
I can tell many of you are already frantically reaching for sanitizing compounds, but that isn't necessary. Most bacteria will not make you sick. In fact, all of us have bacteria in our guts that helps us to digest food, a symbiotic relationship that runs back hundreds of thousands of years.
Since all life requires energy to live, and these nonillions of bacteria are obviously getting their energy from somewhere, I propose a system to collect bacteria, perhaps with a "sticky" surface, or perhaps by vacuum and filter, and seize their energy for our own purposes. We can power them by food waste, or some other such thing, and have lots of green power.