The year was 1987. V Gnanagandhi, head of the cryogenic engine project at the Indian Space Research Organisation (ISRO), wanted to set up a high-pressure hydrogen plant in Mahendragiri near Thiruvanathapuram.
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A new study has found that radioactive particles from nuclear tests that took place decades ago persist in the upper atmosphere. Previously, scientists believed that nuclear debris found high above the Earth would now be negligible.
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A controversial proposal to cool the planet artificially by injecting tiny reflective particles into the upper atmosphere which block out sunlight would cause droughts and climate chaos in the poorest countries of the world, a study has found.
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