the british prime minister, borisjohnson, has warned the un general assembly that failing to act on climate change would lead to disaster. president biden has promised to donate half a billion coronavirus vaccines to poorer countries — the world health organization says help is needed, now. the colombian government says a town near the border with panama has been overwhelme with thousands of migrants trying to reach the united states. the authorities say 19,000 mainly—haitian travellers are stranded there. many of these migrants are reportedly risking their lives by trying to travel at night on substandard boats. the goal for many is to ultimately, with the help of traffickers, make the long and perilous journey through jungle into panama, in the hope of travelling thousands of kilometres north to the us. let's take you now to panama city, and speak with willam spindler —