And for three Mars summers in a row, deposits of frozen carbon dioxide near Mars' south pole have shrunk from the previous year's size, suggesting a climate change in progress.
One of the competing theories for the increase of Earth's temperatures is that the sun is putting out more energy. That theory would indicate effects felt throughout the solar system. So that leaves me a question for astronomers: have there been other changes on the other planets that would or would not be indicative of increased solar radiation? Comparisons of storm activity on Jupiter might be a good place to start.