The year 2024 will be a critical one. The future of Gaza and the West Bank may hinge in part on whether Donald Trump returns to the White House – as may the outcome of the war in Ukraine. China will be locked in a race against time as its population ages. And the natural world will reach a new series of tipping points. But there are some reasons for cautious optimism. With so much happening, it can be hard to know where to look. Here Guardian correspondents offer their…