Or, the other option.The world's cities are going to have to move aggressively to curb their greenhouse-gas emissions, or the whole planet is going to pay for it. That's the word in a new report from the United Nations Human Settlement Program, or UN-HABITAT. The report is called "Hot Cities: Battle-Ground for Climate Change," (you can find a summary and links to purchase the full report here). It paints a dire picture of how an increasingly urban and wealthy global population could mean "potentially devastating effects of climate change on urban populations": Urban centres have become the real battle-ground in …
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