Have you ever pictured a world without the greens?
Yes I'm talking about the plants and all vegetative organisms, it'd be cold and life less, as plants evolve so do the water bodies and other living things.
Ok now let's talk about the air we breath oxygen it's been estimated that the marine plants produce about 70-80percentage of the atmospheric oxygen. Isn't that wonderful?
Not talking about the ecological food chain where the green has to feature as an autonomous organism producing it's own food by use of sunlight in the process of photosynthesis leading to the bedrock of energy pyramid on which other organisms feed.
Green is life without green there's no life
This is only but a little about the 'green' follow me for more stories like this. 
Have a good day