Those are for specific crops. Presumably, if some crops become higher yielding (in a particular area) people will plant more of them so the next effect will be

Those are for specific crops. Presumably, if some crops become higher yielding (in a particular area) people will plant more of them so the next effect will be higher plant growth. Similarly, in nature, plants that benefit most will spread, so the net effect will be higher plant growth. SO overall we should have an increase in plant growth?