Washington (AFP) – Rich countries have an obligation to ensure the Covid-19 pandemic does not undermine efforts to fight poverty worldwide, US Treasury Secretary Janet Yellen said on Tuesday. “It’s the responsibility of the developed countries to make sure that decades of progress in fighting poverty globally and trying to close income gaps between rich and poor countries… is not reversed because of the pandemic,” Yellen said in an appearance during the World Bank and IMF Spring meetings. The IMF unveiled new more optimistic forecasts on Tuesday showing the global economy growing 6.0 percent…