A successful Cop26 is essential for Britain and the world. Here's how it can happen

In November Boris Johnson will host the most important global meeting ever to take place on UK soil. The outcomes of this UN summit on climate change, known as Cop26, will help shape the fates of billions of people for decades to come. For the UK it is also the first big stress-test of its new role in the world after leaving the EU. Superficially the chances of success appear high. The US, China, EU, UK and 97 other countries have now stated that by mid-century their overall emissions of carbon dioxide will be zero . The economics are aligned:…