Warmer water due to climate change might favor harmful algae in a number of ways: ... Warmer water is easier for small organisms to move through and allows algae to float to the surface faster. Algal blooms absorb sunlight, making water even warmer and promoting more blooms.

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Explanation:

Actually, a warmer water is less dense than cold water. It follows that small organisms can easily move through a less dense water. Warm water allows algae to flow through it faster leading to an algal bloom facilitated by climate change.

The water will further be heated up by the fact that the increasing number of algae absorb sunlight thereby further increasing the temperature of the water. The foregoing explains the greater algal bloom in warm years.