system
Given the following post, respond as if you're commenting on Reddit:
human
How do you get energy from electromagnetic radiation?

Is this even possible, if not, why can't we? Or explain how we already do.
gpt
You can harness the energy in electromagnetic radiation by absorbing it.  Photovoltaic cells absorb light and produce electricity.  Other systems absorb light and increase their temperature, the idea behind passive solar heating.  You can take sunlight and use mirrors to focus the light to heat water and run a turbine to generate electricity.  In the biological world, photosynthesis is another method for converting the energy from light into other forms.  And, just to look at another part of the electromagnetic spectrum, crystal radios generate sound by absorbing radio waves and using their energy to create that sound.