So basically increased primary production, increased Nitrogen and Phosphorous cycle, the two elements that are already way beyond earths boundaries...

And also invasive species and biodiversity loss.

Yay...

The hazard from climate change is in the rapid and chaotic change relative to natural changes. And we build our entire civilization and cities around a stable climate. So greener oceans could cause all sorts of problems that are in themselves not bad. Just that we have no idea what will happen. Maybe it should be called climate chaos.

This is the best summary I could come up with:

In the last four decades, the extent of green vegetation — i.e., the amount of leaves in a given area — has substantially increased across the planet, according to a number of recent scientific studies based on satellite data.

In one 2019 study published in the journal Nature Sustainability, scientists found that the Earth had increased its green leaf area (i.e., the amount of leaves) by 5 percent in the last two decades.

“The intensification of agriculture that’s been happening in India over the past four decades is stunning,” said Joshua Gray, a geospatial scientist at North Carolina State University, who was not affiliated with the 2019 paper.

That’s one reason why NASA is expected to launch a satellite called PACE, which will measure ocean color to better understand how plankton communities influence Earth’s climate.

Yet these two landscapes are dramatically different: The rainforest is home to orangutans and rare plants and helps regulate the local climate, whereas the plantation is relatively devoid of life.

The other problem: While CO2 fertilization can make some crops grow faster, research has also found that it can decrease their nutritional value — such as the concentration of protein, and minerals like calcium and magnesium — for a number of complicated reasons.

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