Please choose the correct answer to the question: Due to the increasing average temperature of the atmosphere, polar ice sheets melt at a greater rate than they form. Which of these will be an effect of the continued melting of polar ice?

Answer1: A major reservoir of fresh water will decrease. Answer2: Plant life will increase due to higher sea levels. Answer3: Water runoff will cause an increase in ocean salinity. Answer4: Ocean temperature will decrease with the addition of cold water.

Answer format: answer1/answer2/answer3/answer4