2020 was supposed to be the year countries showed up at the annual UN climate summit in Glasgow with ambitious new plans for cutting carbon emissions by 2030. The summit was delayed by a year due to the pandemic. Instead, the UN and host countries held a one-day online event Saturday to mark the five-year anniversary of the Paris climate agreement and push countries to announce new climate pledges for 2030, in spite of the pandemic. It’s not clear how much it helped — only a fraction of the Paris agreement signatories have or are expected to commit to new 2030 targets before the end of the year. The World’s environment correspondent reports.