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Several of the reports I've seen have said we will get more biomass, but most of it will be plants we generally refer to as weeds.

"It is estimated that between 50% and 85% of the world's oxygen is produced via phytoplankton photosynthesis." Most 'plants' are in the water.

Makes sense, considering that most of the plants we have already match that description.

Most of the plants in residential areas, sure (but only if you think grass is a weed).

Not so much in reasonably well-run parks or woodlands.