The window for keeping global average temperatures from rising more than 1.5 degrees Celsius this century has now closed. For the last decade, global climate politics have revolved around a single number: 1.5 degrees Celsius.  The idea was that keeping the planet below this warming threshold would hold many of the worst impacts of climate change in a manageable range. Cross it, and the risks rise sharply into uncharted territory.  This year, it became clearer than ever that we will cross it. Key takeaways The window of opportunity has closed on the 1.5°C climate target. Though...

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