The reason i ask is because of much the land around the world is covered by farms. We have developed and organised it and planted crops that grow optimally. Look at this picture, farms as far as the eye can see. But what if this farming stopped? There would be random weeds growing, maybe some trees, over time. But it wouldnt be as effecient as what the farmers can do.

You can argue that those fields are a form of natural solar panels. They are absorbing the sun AND co2 among other things, and providing energy to us in the end in the form of carbs and what not.