Washington (AFP) – US President Joe Biden warned nations attending Thursday’s virtual global summit on Covid-19 that there was “still so much left to do” to quell the pandemic, as more than $3 billion in new funding was pledged. The veteran Democrat may however be at pains to spearhead ambitious plans to vaccinate the world and stop the spread of the coronavirus, as Congress has so far refused to authorize billions of dollars in funding. The United States crossed a grim milestone as the summit began, with the White House announcing that more than one million Americans have now died due to Covi…