Environmental and ecological discussion, particularly of things like weather and other natural phenomena (especially if they're not breaking news).
See also our Nature and Gardening community for discussion centered around things like hiking, animals in their natural habitat, and gardening (urban or rural).
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Tuvalu’s population is also very small. Taking in around 10,000 climate migrants would be inconsequential for a country of 28 million like Australia.
More importantly, I would think, is that we are the 6th largest country with the 54th largest population. We should be making these agreements with every other pacific island nation already, and guarantee a much swifter migration rate each.