Reports say another 50 people were killed in Syria today, 30 in the city of Homs, where a lot of the battle has been waged. Tonight we'll talk with one of the only journalists to report from the city under siege. Also today, the U.S. seems to be softening its stance on arming the rebels. Is it really a viable option? We'll dig into the story tonight.

Tensions are rising between Canada and the E.U., which is trying to designate oil sands as a dirtier kind of crude. We'll look at why the stakes are so high in this battle. Plus, a new report says coal is more environmentally damaging than oil. What will it take to improve the image of Canada's oilsands?

Plus, three years after a very public case of domestic abuse, Chris Brown and Rihanna are back together - at least musically. They collaborated on two songs released today. Is it just a PR stunt? Twitter is abuzz about the collaboration - and whether it's a new low for selling music. We'll tap into the debate tonight.

Tune in tonight at 8 p.m. ET on CBC News Network.