Those in the know seem to like repeating the lie that Lake Mead’s low water level is caused by drought. Those of us who are informed realize it’s because CA, AZ and OR are taking water from it in record amounts.
I have seen several forms of artwork done with CDs, and all I can say is, people are so very clever!
James made a turtle.
The idea was that the CDs would be mounted on a hemispherical or parabolic surface, using the central holes for the mounting. A judicious tightening of the screw (and washer) where it is mounted will distort it to a focusing reflection, which can then be concentrated on a cooking device.
Consider it a Dutch Oven, but solar powered. It would probably be a good idea to have some way to monitor the heat developed, or your project may have the flavor of ashes.