Laurence Tubiana is CEO of the European Climate Foundation and was formerly France's Climate Change Ambassador and Special Representative for COP21 in Paris.The UN has released a report this week confirming what many people have feared: the world is going to pass 1.5C of warming.At current emissions, the remaining carbon budget will be exhausted within roughly three years. We are heading into “exceedance” of the 1.5C threshold: a sustained breach of the Paris Agreement's primary temperature goal before any possible return below it.