Police rounded up more than 1,400 protesters on Wednesday as Russians in dozens of cities took part in rallies organised by allies of hunger-striking Kremlin critic Alexei Navalny over his failing health in jail. <br /> <br />In other news, Joe Biden unveiled the goal to cut emissions by 50 per cent-52 per cent from 2005 levels at the start of a two-day climate summit kicked off on Earth Day and attended virtually by leaders of 40 countries including big emitters China, India and Russia. <br /> <br />Watch this episode of World Today to know more.
