Every SDXL image uses something like 0.5 Watt-hour. That means that 2000 sdxl images uses about 30 cents of electricity. If we multiply that by 30x for video (a fair assumption for models like minimax H3, which take that much longer to make video), that means you get almost 700 5-second videos for a dollar of electricity, which is about a kilo of carbon dioxide. More or less depending on where your electricity comes from.