If a warm bottle of soda and a cold bottle of soda are opened which will effervesce more and why?

The colder soda.

Explanation:

Leaving a soda in the sun will make the soda go flat. You can also notice when you watch the outside soda there will be drops forming on the outside. But in the freezer the soda will not start to form water droplets. So the water on the outside is taking away the fizz and watering dow the soda