It's doubtful at best that Earth's warming is related to any warming that might be occurring on other planets. Other planets have core compositions different than that of Earth. They have different surface environments and atmospheres, both of which have chemical reactions unlike those on Earth. They have different interior and surface temperatures, different climates, and different orbital paths and times. There are no humans on other planets. All of which points to the virtual certainty that Earth's warming is caused by factors unique to Earth. Art Hall and his fellow deniers are wrong.