“How to combat acid rain, 100-year storms,” (letters, March 25). Seriously? You’re printing someone’s crackpot “theory” (based, apparently, on no evidence whatsoever) about climate change being caused by rocket launchings? Global warming is not a joke; It’s an existential threat to humanity and all life on Earth. We need serious, act-based information about it and solutions based on scientific and economic facts. Every scientific body of national or international standing agrees that our present period of global warming, which causes climate change, is caused overwhelmingly by humans burning fossil fuels (National Academy of Sciences, AAAS).