LOS ANGELES -- The climate on Mars is showing a warming trend and recent images have shown the first evidence of seismic activity on Earth's neighbor planet, scientists said today. New gullies that did not exist three years ago have been pictured on a Mars sand dune -- just another of what scientists say are surprising discoveries found by cameras aboard the 8-year-old Mars Global Surveyor that are changing notions about the climate and formation of Mars. "To see new gullies and other changes in Mars surface features on a time span of a few years presents us with a...