Now playing Next USA This ice-making submarine would pop out bergs to replace dwindling sea ice Proposed vessel would ply polar waters as part of plan to curb climate change, but scientists have their doubts. 06/08/2019
Now playing Next Greenland Before and after pictures show Greenland's rapid ice melt from space The scale of the melt in Greenland during the August heatwave is difficult to comprehend but satellite imagery shows the true extent of the thaw. 06/08/2019
Now playing Next The Cube 8chan is at the centre of three mass shootings, should it be banned? Time could be up for anonymous message site 8chan. 05/08/2019
Now playing Next USA Ex-MLB commissioner says baseball was fortunate players didn't take a knee Still, the longtime baseball leader said, "I don't think we're less willing to play a role in things in this country than the other sports are." 03/08/2019
Now playing Next USA Colorado looks to medical marijuana to ease opioid crisis It becomes the third state in the nation after New York and Illinois to allow doctors to recommend medical marijuana instead of opioids for pain relief. 02/08/2019
Now playing Next Green News "Love Water" campaign to encourage Britons to look after waterways Parts of Britain might run out of water within 25 years if the public don't change their wasteful ways. 01/08/2019
Now playing Next USA Who won Night Two of the second Democratic debate? 10 presidential candidates took the stage. Some had a good night, some didn't. Here's our take. 01/08/2019
Now playing Next USA 5 fights at the Democratic debate The second face off in the race for president exposed a split between the moderate and progressive contenders. 31/07/2019
Now playing Next USA Who won the Democratic debate? 10 candidates for president faced off in Detroit Tuesday night. Here's who left the stage better off than they arrived — and who didn't. 31/07/2019
Now playing Next USA Fact checking the second Democratic debate, Night 1 While 10 candidates hit the debate stage, here are the claims that hold up and the ones that don't. 31/07/2019
Now playing Next USA Second Democratic debate kicks off in Detroit with Warren and Sanders By a fluke of the draw used to determine the lineup, Tuesday night's stage will feature 10 white candidates in a majority-black city. 31/07/2019
Now playing Next USA All-white Democratic debate set to grapple with Trump and race in Detroit Subplots abound as top-tier progressives take center stage and also-rans look for traction. 30/07/2019
Now playing Next USA What 2020 Democrats learned from their first debate and how some are sharpening their attacks for the second The 20 Democrats appearing on the stage this week have been hard at work fine-tuning their messaging. 30/07/2019
Now playing Next USA Second Democratic debate: Everything you need to know Key matchups on Tuesday and Wednesday include Sens. Bernie Sanders and Elizabeth Warren on Night 1, and Joe Biden and Sen. Kamala Harris on Night 2. 30/07/2019
Now playing Next USA Methodology for 'Journey to power: The history of black voters, 1976 to 2020' The data covers, to the best of our knowledge, every Democratic presidential primary exit poll conducted by national media organizations since 1976. 29/07/2019
Now playing Next USA 1976: Jimmy Carter begins his march A decade after the Voting Rights Act, millions of black Americans remained unregistered to vote. 29/07/2019
Now playing Next USA Warren, Sanders to split center stage on first night of debate Experts predict little drama between the two Democratic progressives, but they could come under fire from the other candidates. 29/07/2019