Let's be clear about something; climate scientists almost universally agree that there is no such thing as "winning" or "losing" the fight against climate change (Suzuki, for the record, is a zoologist, not a climate scientist). This isn't a game, there's no referee, and no one gets a trophy at the end.
The battle against climate change is about mitigating harm. The worse we do, the more harm there will be. But there is never a point where it is "too late". The car is going to crash, but the sooner you hit the brakes, the less damaging the impact will be. Everything we do to push the needle will save lives. There is never a point where we get to throw up our hands and succumb to the comforting fantasy that it's "too late" to change anything.
I have a lot of respect for Suzuki, and I don't blame him for feeling defeated with everything that's happening, but spreading this kind of message is, dangerous, damaging, and flies entirely in the face of the science.