Radio astronomer here! You exert more energy when you unfold a single piece of paper than we have collected in all the radio waves we have ever collected from outer space.
Edit: lengthy explanation time! Some of you guys might recall from chemistry physics class, there is a simple relationship for calculating the energy in a wavelength, which is Energy= hc/lambda, where h is the Planck constant, c is the speed of light, and lambda is the wavelength of your frequency. Radio waves are very large on the electromagnetic spectrum’s scale- when discussing visible light for example we discuss it in nanometers, but the most famous radio astronomy frequency (where we see the hydrogen line) is 21 centimeters, ie many many times longer. So, for example, if you go to this calculator and input the frequency I work at- 57 MHz- you will see you get about 2.4E-7 electron Volts per photon, and it’s 2.6E22 eVs in one calorie.
Further, radio astronomy is also just dealing with very faint sources- if your cell phone was on the moon it would be one of the brightest radio things in the sky. We learn a lot from it, but there just really isn’t that much energy in it! (Which is why, btw, people listen for radio signals from aliens a la SETI- very low energy for a strong signal- but that’s another story for another post!)