system
Given the following post, respond as if you're commenting on Reddit:
human
Would it be possible to use gravity as an energy source?

If you could "capture" the pull of gravity somehow, could you use it as a power source?
gpt
we already do it. 

Hydro electric power. 

We use different level of water to make some kind of waterfall and put a turbine under the falling water.
 
Hydroelectricity is the term referring to electricity generated by hydropower; the production of electrical power through the use of the gravitational force of falling or flowing water. It is the most widely used form of renewable energy, accounting for 16 percent of global electricity generation – 3,427 terawatt-hours of electricity production in 2010,[1] and is expected to increase about 3.1% each year for the next 25 years.