The latest county-level trials could boost rooftop solar power generation over the next five years but new business models are needed to make them successful.

UNITED NATIONS, Sept 22 (Reuters) - Leaders from developing nations warned the U.N. General Assembly this week that COVID-19 vaccine hoarding by wealthy countries left the door open for the emergence of new coronavirus variants even as infections already increase in many places.

The regional meeting comes as Cuba is playing a growing role in combating the COVID pandemic globally. Just this week, Vietnam signed a deal to buy 10 million doses of a Cuban-made vaccine. Cuba is already at the forefront globally of vaccinating children. Cuba recently began vaccinating children as young as 2 years old.