<p>Prime Minister Mark Carney is off to Beijing -- and a former Canadian ambassador to China tells us he'll need to balance security and human rights concerns on one side, and the need for new trade commitments on the other.</p><p><br></p><p>Dozens of high-level economic officials in the U.S. come to the defence of Federal Reserve Chair Jerome Powell -- who says criminal allegations are just part of Donald Trump's attempt to politicize the central bank.&nbsp;</p><p><br></p><p>The executive director of Kashechewan First Nation is racing to get people out after its water treatment plant failed. He says help -- and a permanent fix -- can't come fast enough.</p><p><br></p><p>It's still true that microplastics are pretty much everywhere -- but our guest says some high-profile assertions about their impact on the human body may have been overblown.&nbsp;</p><p><br></p><p>The U.S. Postal Service recognizes Muhammad Ali with an official stamp -- and his widow tells us she's pleased as punch.&nbsp;</p><p><br></p><p>Good news for the flightless parrot known as the kakapo -- a bumper crop of berries means a future bumper crop of baby kakapos.</p><p><br></p><p>As It Happens, the Tuesday Edition. Radio that's kind of a chick magnet. Radio that looks forward to a rise in helicopter parroting.&nbsp;</p>