The leaders of the world’s economic powerhouses gathered Saturday for the first in-person summit since the coronavirus pandemic, with climate change, Covid-19 economic recovery and the global minimum corporate tax rate on the agenda.Italian Premier Mario Draghi welcomed the Group of 20 heads of state to Rome’s Nuvola cloud-like convention center in the Fascist-era EUR neighborhood, which was sealed off from the rest of the capital. Saturday’s opening session was focused on global health and the economy, with a meeting on the sidelines for key leaders to discuss next steps on Iran’s nuclear program.Italy is hoping the G-20 will secure key commitments from countries representing 80% of the global economy — and responsible for around the same amount of global carbon emissions — ahead of the U.N. Climate conference that begins Sunday in Glasgow, Scotland.