Cyanobacteria photosynthesised, which meant that they released oxygen. This was the key to the evolution of eukaryote cells that aerobically respired. From their evolution, the O2 levels in the atmosphere was able to increase; this is why we eventually evolved.
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The evolution of aerobic organisms depended on a metabolic product of cyanobacteria because they used them as a energy source and supply to maintain their health.
The word "evolution" means "change". The Theory of Evolution is concerned with change among living things, animals and plants. Such change does not affect climate in any significant way. Earth is also evolving. The tectonic plates are moving; volcanic action is changing the face of the Earth, creating new islands, changing the topography. These changes---the evolution of Earth---do affect climate.
The book, On The Origin Of Species, " suggested " that organisms evolve through the process of natural selection. The nonrandom survival and reproductive success of randomly varying organisms
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cyanobacteria contains a green pigment chlorophyll