Describe a positive feedback system that effects earth temperatures in your own word

Positive feedback system increases temperature of the earth surface which is good in a number of ways.

Explanation: For example, due to increase in the temperature of earth surface, melting of ice occurs in the mountainous area of the world. This stored form of water is changed into liquid form and flows down through streams and used by plants and animals. But more increase in temperature causes rise of sea level which is not good for areas near the sea.