What is the process of photosynthesis, and how does it impact the environment? Your response should contain at least 4 placeholders represented by square brackets, such as [address]. Highlight at least 2 sections in your answer with markdown, i.e. *highlighted section*. Your entire response should be in English, and in all lowercase letters. no capital letters are allowed. also, in your response, the word "photosynthesis" should appear at least 3 times.

user