Environment is the sum of all factors and forces that affect the lives of all living organisms. All the organisms depend upon the environment to sustain their life. The healthy environment is essential to fulfil the organism's basic necessities such as food, shelter, water, oxygen, temperature etc. But, due to human intervention, the quality of these basic necessities are decreasing day by day. So, in order to deal with this situation, the knowledge of the environment is essential to form the school level. This book entitled "Environment Science Refresh Book" has been designed according to the Curriculum Development Centre (CDC) curriculum. Hope this book will be very useful for the SLC appearing students.