As head of the UN's climate change agency, I know this year is crucial for the future of humanity | Patricia Espinosa

Fighting climate change may be the most important task we face today - and the US's renewed commitment to it is welcomeNearly three decades ago, during the Earth Summit held in 1992 in Rio de Janeiro, the international community acknowledged the need to address the growing challenges posed by the state of the environment. Several resolutions and agreements emerged from that historic conference, among them the UN Framework Convention on Climate Change. The ultimate goal of this multilateral initiative has been to prevent unchecked, runaway climate change from harming natural ecosystems, threatening food production or hindering sustainable development. In short, to preserve the world as we know it.For three decades, countries - or parties, as they are known under the convention - have debated and deliberated on the mounting threat posed by human activities to the stability of the climate system and, consequently, to the future of our planet. Progress has been slow, often disappointingly so. But there have been major achievements, such as the Kyoto protocol in 1992 and, most significantly, the 2016 Paris agreement, which constitute landmarks in the development of an international regime that protects the climate. Continue reading...