Answer:
When it comes to me, you go on red and stops on green. What am I?
Part carbon part water I am poison to the fishes. Many falsely claim my name I am the pause that refreshes.
People need me, yet they give me away every day. What am I?
I am the only thing that place today before yesterday. (one word)
First you see me in the grass dressed in yellow gay; next I am in dainty white, then I fly away. What am I?
The warmer I am the fresher I am.