I can't find it back but there was a blog post explaining that earth plants could have been red instead of just green. Do you imagine red forests?? And this is

I can't find it back but there was a blog post explaining that earth plants could have been red instead of just green. Do you imagine red forests?? And this is not science fiction at all, brown and red photosynthesis can be as efficient hence why it is very common underwater. However some contingent "choices" have been made at the origin of photosynthesis and no terrestrial plant has preserved the necessary gens and such gens cannot be developed back. However horizontal gene transfer might be a hope of seeing one day a red planet (though a human made OGMs is likely the best strategy)