For a landmark moment in the global effort to stave off catastrophic climate change, Joe Biden’s “climate day” at the White House was rather low-key. The US president bumped elbows with his newly appointed climate tsar, John Kerry, who he called his “best buddy”, then gave a short speech before perfunctorily signing a small stack of executive orders, donning his mask and striding out without taking any questions. The vision laid out in the...