Ok, well that first peer-reviewed study was great. It was looking at what temperature it takes for the cellular mechanisms of photosynthesis to break down. It found a 'critical temperature' at 46-48C and was very convincing.

46C is insanely hot. 12 degrees hotter than the hottest place on earth, the middle of the Ethiopian desert.

Serious climate modelers don't go much beyond 100 years, but no one is predicting 46C oceans in the next few centuries, or at all.

And before those photosynthetic apparati break down, photosynthesizers will benefit from the increased carbon in the air and water. That doesn't include corals, with their complex symbiosis with another eukaryote, but it's kind of common sense that plants will do well in higher pCO2.

6CO2 + 6H20 = C6H12O6 + 6O2

That second link is to a 2011 blog that links to popular articles as sources. Not sure what to say about that.

I'd be interested to read the paper on nitrogen uptake under climate change scenarios - do you know the title?

I'd just point out that the reason that studies showing that photosynthesis might not be beneficial under climate change scenarios are interesting to journals is that they go completely against the established science of the past decade, predicting that it will.