solar
Explanation
The comic shows a presentation about a plan to assemble megastructures of mirrored black solar panels across the Sahara Desert, using energy visible from space as a novel approach to solving climate change. An audience member asks "That's nice, but when are you going to put up transmission lines?" The next panel zooms out to show the Earth, where the solar panel array has been arranged to spell out "ALIENS PLEASE HELP."
The joke has two layers. First, it mocks the tendency to propose grandiose technological solutions to climate change while ignoring mundane practical problems (like transmission infrastructure to actually distribute the energy). Second, and more importantly, the reveal is that the real plan was never about solar energy at all -- it was about using the panels as a giant message visible from space, begging aliens for help. This satirizes the sense of hopelessness some people feel about solving climate change through human effort alone, suggesting we might as well just ask for extraterrestrial intervention.