Stephen Hawking: Humans need to leave Earth or risk being annihilated by nuclear war or climate change – from a collection of essays that were published this week.
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- Retired admiral says climate-change research may mean ‘our survival’. Climate change is a threat to coastal military installations and, in a larger sense, to national security overall.
- An autonomous system just launched, hoping to clean 50% of the Great Pacific Garbage Patch in just five years