Human activity such as the burning of fossil fuels has an effect on the overall increase of the Earth's temperature. Raising the Earth's temperature means that there is an increase of evaporation, melting of land and sea ice, and impacts on other processes of the water cycle that adversely affect the climate on Earth.
Six carbon dioxide atoms plus six water atoms plus sunlight yields to produce glucose and six oxygen atoms. Sunlight is important because it is the main source of ATP (energy) in photosynthesis. Hope this helps!